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Will Cathcart
@wcathcart
Head of at
Science & TechnologyMenlo Park, CAwhatsapp.comJoined March 2009

Will Cathcart’s Tweets

I read the information Apple put out yesterday and I'm concerned. I think this is the wrong approach and a setback for people's privacy all over the world. People have asked if we'll adopt this system for WhatsApp. The answer is no.
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Today is LIVE on with our first end-to-end shopping experience. You can browse products, add your items to your cart, and make your payment -- all within a WA chat! Excited about the opportunities this opens up for businesses to build experiences on WhatsApp!
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I've been watching a bunch of discussion this week about the privacy policy update we’re in the process of making and wanted to share some thoughts. Thread 👇
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Today is taking a stand against the dangerous use of spyware. NSO Group claims they responsibly serve governments, but we found more than 100 human rights defenders and journalists targeted in an attack last May. This abuse must be stopped.
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Happy New Year! While many of us celebrated by texting our loved ones on WA, there are millions of people in Iran and elsewhere who continue to be denied the right to communicate freely and privately. So today we’re making it easier for anyone to connect to WA using a proxy.
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Very excited to be launching a beta of our new multi-device capability for . Now you can use our desktop or web experiences even when your phone isn't active and connected to the internet. All secured with end-to-end encryption. Learn more:
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We’ve had personal computers for decades and there has never been a mandate to scan the private content of all desktops, laptops or phones globally for unlawful content. It’s not how technology built in free countries works.
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Communities on is starting to roll out globally! With Communities admins can connect related groups for their organizations, neighborhoods, and workplaces. To get started tap on the brand new Communities tab. Check it out:
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Instead of focusing on making it easy for people to report content that's shared with them, Apple has built software that can scan all the private photos on your phone -- even photos you haven't shared with anyone. That's not privacy.
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🎉 Reactions on are now even better. We've added support for you to use any emoji you want (in any skin tone) as a reaction, so you can 👏 or 🤷 or 🤦 or 🤯 or 💚 or ...
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Reminder to users that downloading a fake or modified version of WhatsApp is never a good idea. These apps sound harmless but they may work around WhatsApp privacy and security guarantees. A thread:
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This is an Apple built and operated surveillance system that could very easily be used to scan private content for anything they or a government decides it wants to control. Countries where iPhones are sold will have different definitions on what is acceptable.
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…”it would be wrong for the government to force us to build a backdoor into our products. And ultimately, we fear that this demand would undermine the very freedoms and liberty our government is meant to protect.” Those words were wise then, and worth heeding here now.
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For people in 🇧🇷🇨🇴🇮🇩🇲🇽🇬🇧: you can now search for businesses using our WhatsApp Business Platform right on , either by browsing a list of categories – like travel or banking – or by typing the name.
Screen shots that show searching for a business by name in WhatsApp.
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People in Bengaluru can now buy their metro ticket directly on . Excited to see many more everyday transactions available on our platform!
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Replying to @cpronammametro
Namma Metro is happy to give additional facility for commuters- QR Code based Single Journey Metro Travel Tickets can be downloaded from WhatsApp from 1st Nov 2022. Commuters are requested to make use of this facility
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We need more companies, and, critically, governments, to take steps to hold NSO Group accountable. Once again, we urge a global moratorium on the use of unaccountable surveillance technology now. It’s past time.
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That's why we continue to defend end-to-end encryption so tirelessly.  To those who have proposed weakening end-to-end encryption: deliberately weakening security will have terrifying consequences for us all.
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This is a wake up call for security on the internet.  The mobile phone is the primary computer for billions of people.  Governments and companies must do everything they can to make it as secure as possible.  Our security and freedom depend on it.
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At the time, we worked with , who identified 100+ cases of abusive targeting of human rights defenders and journalists in 20+ countries.  But today's reporting shows that the true scale of abuse is even larger, and with terrifying national security implications.
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New features for Status! You can now share voice messages on status, use the audience selector for added privacy, and quickly respond to updates from others with reactions. We've also added profile rings so it's easier to spot new updates, and improved link previews.
Five Screen shots showing new status features on WhatsApp: private audience selector, voice status, status reactions, status profile rings, link previews.
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Will this system be used in China? What content will they consider illegal there and how will we ever know? How will they manage requests from governments all around the world to add other types of content to the list for scanning?
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I want to share how committed everyone is to providing private communication for two billion people around the world. At our core, that’s the ability to message or call loved ones freely protected by end-to-end encryption and that’s not changing.
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We're entirely back up and running now. We know that people were unable to use to connect with their friends, family, businesses, community groups, and more today -- a humbling reminder of how much people and organizations rely on our app every day.
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It's important for us to be clear this update describes business communication and does not change WhatsApp’s data sharing practices with Facebook. It does not impact how people communicate privately with friends or family wherever they are in the world.
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2022 was our biggest year yet. Our team was so excited to build Communities, Reactions, Polls, Avatars, 32-person video calling and so much more. A huge thank you to everyone who gave us feedback on how to make even better. There’s a lot more coming in 2023!
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We're adding new features to make voice messages on even better. Updates include draft preview, ability to pause/resume recording, out of chat playback, resume playback where you were, and waveform visualization. Excited for people to try these soon!
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Can this scanning software running on your phone be error proof? Researchers have not been allowed to find out. Why not? How will we know how often mistakes are violating people’s privacy?
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NEW: Use on more than one phone! Thanks to some improvements in our multi-device technology, we are rolling out the ability to link a second phone (or third, or fourth) to your WA account. And, of course, it’s all still protected by end-to-end encryption.
Screen shot that shows WhatsApp running on two separate phones.  Text says "One WhatsApp" and then "Multiple phones".
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Payments is live on in Brazil! 🇧🇷 Send money to your friends and family. It's free, secure, and as easy as sending a photo. Thanks to all our partners who helped make this possible!
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This is amazing. In Buenos Aires, people can now send an audio clip of their cough using a WhatsApp voice memo to the Boti chatbot and it'll check the audio pattern for COVID. Accuracy is apparently 88%.😮
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Estamos desarrollando un sistema con Inteligencia Artificial para detectar patrones de Covid19 a través de audios de tos 🗣️. Sí leíste bien, con AUDIOS DE TOS. Por eso si hace poco te hiciste un test en la Ciudad podés colaborar con el proyecto. Mirá el video y enterate cómo 👇🏻
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Today we’re very excited to share our vision for a feature we’re calling WhatsApp Communities. This is new functionality we’re building to support the many organizations that use WhatsApp to communicate in a private and secure way.
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Payments, as easy as sending a message. Available to people across India starting today.
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Starting today, people across India will be able to send money through WhatsApp 💸 This secure payments experience makes transferring money just as easy as sending a message.
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What will happen when spyware companies find a way to exploit this software? Recent reporting showed the cost of vulnerabilities in iOS software as is. What happens if someone figures out how to exploit this new system?
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That’s why we are so committed to end-to-end encryption, and why we keep improving the privacy of WhatsApp, such as with our launch of disappearing messages in November. Our innovation on privacy will continue.
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There are so many problems with this approach, and it’s troubling to see them act without engaging experts that have long documented their technical and broader concerns with this.
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Avatars are now available on WhatsApp! Create your personalized avatar and share it as one of 36 stickers from your custom sticker pack, or use it as your profile picture as a way of representing yourself that feels more private than using a real photo.
Image showing someone choosing an Avatar to use as a sticker for a WhatsApp message, as well as several different examples of Avatars
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Today is the 6th anniversary of completing the roll-out of end-to-end encryption. This foundational security technology protects people’s ability to communicate privately and securely.
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We’re in a competition on privacy with others and that’s very good for the world. People should have choices in how they communicate and feel confident that no one else can see their chats. There are people who disagree with this, including some governments.
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We’re proud of the service we offer, and we’ll continue to develop technology and practices to provide private, secure communications for as many people as we can.
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Not everyone may realize how common it is to WhatsApp message businesses in many countries. In fact, about 175 million people message a business account each day on WhatsApp and more want to do so.
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I wouldn't use Telegram for anything private. Unlike WhatsApp, Telegram doesn't have default end-to-end encryption and no way to turn it on for groups. That means Telegram has a copy of your messages, and that worries me. said it best here: twitter.com/moxie/status/1
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Telegram Founder Warns People To 'Stay Away From WhatsApp' Should people stay away from Telegram?, @wcathcart independent.co.uk/tech/whatsapp-
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Today we're answering some common questions we've received . Our policy update describes business communication and adds transparency. It does not impact how people communicate privately with friends or family. Learn more and share please: faq.whatsapp.com/general/securi
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Replying to @WhatsApp
Our privacy policy update does not affect the privacy of your messages with friends or family. Learn more about how we protect your privacy as well as what we do NOT share with Facebook here: faq.whatsapp.com/general/securi
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Also businesses want tools to quickly and effectively respond to those messages. It’s too hard today and features like Shops and Pay can help people buy things they want from businesses on WhatsApp.
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The world has never been more connected yet there are still internet disruptions that threaten people’s access. We hope that making it easier to use a proxy will make it that much harder to violate people’s right to communicate privately.
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Some new features for group calls on : You can now mute or message specific people on a call (great if someone forgets to mute themselves!), and we've added a helpful indicator so you can more easily see when more people join large calls.
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This morning the U.S. Senate Judiciary Committee held a hearing on the "EARN IT" Act. While not directly mandating a backdoor, as written, this act would form a commission that could have the power to require services like to stop offering end-to-end encryption. 1/
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Excited that the Central Bank of Brazil has authorized the launch of WhatsApp's new payment feature! Soon, Brazilians will be able to browse products, add them to a cart and make secure payments to small businesses right from a chat with your credit or debit card. Vambora!
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Another step forward in accessing essential government services in India through ! You can now easily access your PAN Card, Drivers License and more here: wa.me/919013151515 Thanks !
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Fetching your important documents is now as easy as chatting with your friend on WhatsApp! Enjoy #DigiLocker services through the #MyGovHelpdesk. Send 'Hi' to 9013151515 on WhatsApp to access your Insurance Documents, PAN Card, Driving License, etc.
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We’re kicking this off in São Paulo which is home to millions of small businesses. For those who aren't in São Paulo to try it out, here's what it looks like:
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Thank you for highlighting this important effort as #IndiaFightsCorona - is helping people stay connected in this difficult time and this important information can help keep people safe.
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Now receive authentic information about #CoronaOutbreakIndia through WhatsApp. Save 9013151515 on your phone as MyGov Corona Helpdesk. Send Namaste or Hi to this number from your WhatsApp. Follow the menu instructions to receive information. #IndiaFightsCorona twitter.com/narendramodi/s…
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Thank you for chatting with us!
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Will Cathcart and Mark Zuckerberg confirm to WABetaInfo 3 features to come on @WhatsApp! 😱 @wcathcart wabetainfo.com/will-cathcart- This is an amazing story. Disappearing mode, view once and multi device features are coming soon for beta users!
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Some important reminders in here for people communicating privately right now: As always, your personal messages and calls are protected with end-to-end encryption by default so they cannot be intercepted by any government.
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Meta’s Ongoing Efforts Regarding Russia’s Invasion of Ukraine about.fb.com/news/2022/02/m
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And we're working to make WhatsApp more efficient. Thanks to some of the great work from our friends at we've recently been able to improve our server efficiency by 25%, which means that even as we grow we’ll use less energy to support each person’s use of WhatsApp.
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Agora você pode realizar o seu pré-cadastro para a vacina contra a Covid-19 em São Paulo no WhatsApp: WA.me/5511952202923. Sabemos que este é um momento difícil no Brasil e estamos honrados em poder ajudar com o processo para a vacinação.
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💬 Em São Paulo, agora é possível fazer o pré-cadastro para a vacinação contra a COVID-19 via Whatsapp. É rápido e fácil! Basta mandar uma mensagem para o número +55 11 95220-2923 ou acessar wa.me/5511952202923? e seguir o passo a passo.
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Thank you to everyone who has helped share facts about how protects your privacy. We’re going to do more over the coming weeks to make sure everyone knows how WhatsApp secures your messages. We’re also moving back our business plans to focus on this effort.
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Thank you to everyone who’s reached out. We're still working to counter any confusion by communicating directly with @WhatsApp users. No one will have their account suspended or deleted on Feb 8 and we’ll be moving back our business plans until after May - blog.whatsapp.com/giving-more-ti
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You can now message in to book a ride! Really excited to see this come to all of India next year: making this as simple as sending a message is a great way to make it accessible and easy to use for many more people across the country.
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🤳🏼🚘 @WhatsApp @wcathcart uber.com/en-IN/newsroom
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Today we’re partnering with and to enable people to make their vaccine appointments via WhatsApp. Spread the word: wa.me/919013151515
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Now book vaccination slot by simply sending ‘Book Slot’ to @MyGovIndia Corona Helpdesk on @WhatsApp, verify OTP & follow the steps wa.me/919013151515 Grateful to WhatsApp & @haptik for their continued support to build this chatbot @PMOIndia @mansukhmandviya @AshwiniVaishnaw
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Have a group that's a little noisy and cluttering up your inbox? With the new Archive, you can now keep an active thread out of your inbox, but still have access to it whenever you want!
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This is a really important article from about Telegram. If you think Telegram is secure, you should read this article and understand the truth - especially before you use it for anything private. Some really important points:
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To hear its founder tell it, Telegram was founded precisely to allow users to communicate in ways that skirt authoritarian surveillance. Yet Russian authorities are wielding it as a powerful weapon against antiwar activists. How? wired.trib.al/8hLXQNo 📹: Irene Suosalo
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We’re also adding more great features: polls, 32 person video calls, and groups with up to 1024 people. Like reactions, larger file sharing, and admin delete - we think these features will be particularly helpful for Communities but are available in any group!
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We take our mission seriously, and I'm grateful to everyone who worked hard to bring our service back with the reliability you expect from . We'll learn and grow from this, and continue working to provide you with a simple, secure, and reliable private messaging app.
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We’re expanding the marketing campaign we started back in January to tell people in the U.S. about the importance of end-to-end encryption. 5.5 billion SMS messages are still sent daily in the U.S., but SMS messages aren’t secure.
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You'll be able to leave group chats without having to tell everyone. Only the admins will be notified. Almost like leaving a party quietly and only informing the host 😀.
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Introducing WhatsApp Channels!
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🆕🆕🆕🆕 Introducing your new favorite way to stay in the loop ➰ Channels on WhatsApp lets you privately follow the topics you care about. Available now in Colombia 🇨🇴 and Singapore 🇸🇬 Coming soon 🌎
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This paper is definitely worth reading. It's from some of the leading minds on computer security and it goes into great detail on why client side scanning (CSS) -- which opposes -- would be very dangerous for us all.
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👋 ! I think this new name for Facebook (the company) is an important step that helps people understand the social experiences we’re building for the future. It will also help us communicate more clearly about our services.
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