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random_walker's profile
Arvind Narayanan
Arvind Narayanan
Arvind Narayanan
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@random_walker

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Arvind NarayananVerified account

@random_walker

Princeton prof. I use Twitter to share my research and commentary on algorithmic fairness, AI hype, the surveillance economy, tech policy, and academic life.

Princeton, NJ
cs.princeton.edu/~arvindn/
Joined December 2007

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    Arvind Narayanan‏Verified account @random_walker 3 Feb 2018

    Now that the dust has settled a bit on the Strava heatmap privacy story, what lessons can we learn? I was interviewed about this on CBC radio. Here are the highlights.http://www.cbc.ca/radio/spark/383-dangerous-data-libraries-and-more-1.4516637/exercise-app-shows-why-anonymous-data-can-still-be-dangerous-1.4516651 …

    12:20 PM - 3 Feb 2018
    • 127 Retweets
    • 227 Likes
    • 🔸💤🔸 mr. brightside Cleobille 🍀ᶘ ᵒᴥᵒᶅ🌺😺̼ ̼̼ ̼̼̼̼̼̼ ̼̼̼̼̼̼ ̼̼̼̼̼̼̼⏳🌎🌍🌏🎗☀🥞 Lucid00 manu·e (Toulouse) 🟦 Kim Nayyer . K.Nazran()
    4 replies 127 retweets 227 likes
      1. New conversation
      2. Arvind Narayanan‏Verified account @random_walker 3 Feb 2018

        If we’re worried about state actors getting this information, they’re not limited to looking at public websites. Dozens of companies have incredibly sensitive, fine-grained location data on millions of individuals. These are juicy targets for coercion or hacking.

        2 replies 17 retweets 45 likes
        Show this thread
      3. Arvind Narayanan‏Verified account @random_walker 3 Feb 2018

        The Strava heatmap is a symptom of a bigger problem. Let’s use it as a trigger for a conversation about the deeper issues that it hints at, one of which is the lack of public oversight of how companies collect and use sensitive data.

        3 replies 78 retweets 123 likes
        Show this thread
      4. Arvind Narayanan‏Verified account @random_walker 3 Feb 2018

        When data is taken out of context, when data from multiple users is combined, and when algorithms process data to infer facts that aren’t directly disclosed, privacy issues are exacerbated.

        1 reply 19 retweets 45 likes
        Show this thread
      5. Arvind Narayanan‏Verified account @random_walker 3 Feb 2018

        Tech companies frame privacy as an issue for individual users to figure out. For example, Strava’s response has been to point people to the site's privacy controls and opt-outs. But of course that doesn’t solve the problem, because everyone’s behavior affects everyone else.

        5 replies 25 retweets 60 likes
        Show this thread
      6. Arvind Narayanan‏Verified account @random_walker 3 Feb 2018

        Arvind Narayanan Retweeted zeynep tufekci

        Zeynep Tufekci argues powerfully that privacy is better thought of as a public good like air quality or safe drinking water. The framing of privacy in terms of individual negotiation breaks down here (and in many, many other cases).https://twitter.com/zeynep/status/958325186310307840 …

        Arvind Narayanan added,

        zeynep tufekciVerified account @zeynep
        My latest for the @nytimes. The Strava debacle shows that individualized "informed consent" is not sufficient for data privacy. Given the complexity, companies cannot fully inform us, and thus we cannot fully consent. Data privacy is more a public good. https://www.nytimes.com/2018/01/30/opinion/strava-privacy.html … pic.twitter.com/vcSeRIw1G5
        Show this thread
        3 replies 127 retweets 221 likes
        Show this thread
      7. Arvind Narayanan‏Verified account @random_walker 3 Feb 2018

        Besides, Strava’s privacy controls can be confusing. For example, "Privacy Zones" allow you to hide your activities that lie in a circle around your house. But if I grey out a circle around my house, isn’t my house just the center of that circle?! So haven’t I revealed it anyway?

        1 reply 10 retweets 52 likes
        Show this thread
      8. Arvind Narayanan‏Verified account @random_walker 3 Feb 2018

        Maybe not, but the point is, I couldn’t figure it out. And I’m supposed to be a privacy expert. The typical user, who might be a runner excited about sharing their routes fellow athletes, isn’t invested in mastering these privacy features and their implications.

        1 reply 3 retweets 34 likes
        Show this thread
      9. Arvind Narayanan‏Verified account @random_walker 3 Feb 2018

        Many Strava users use fake names. Can they be de-anonymized by cross-referencing their location traces with profiles on other social media platforms? This kind of question is the topic of research papers. It just isn’t reasonable to expect users to figure it out.

        2 replies 10 retweets 40 likes
        Show this thread
      10. Arvind Narayanan‏Verified account @random_walker 3 Feb 2018

        Strava first released the heatmap in 2014. In Nov 2017 they released an updated, more detailed version. But it was a chance finding by @Nrg8000 a week ago that made this a major story. That makes me wonder: how many other such privacy fails have we never heard about?

        2 replies 11 retweets 41 likes
        Show this thread
      11. Arvind Narayanan‏Verified account @random_walker 3 Feb 2018

        On the other hand, wouldn’t it be great if there were organizations with the resources and the incentives to systematically analyze products for privacy impact, and alert the public when there is a screw-up?

        4 replies 10 retweets 43 likes
        Show this thread
      12. Arvind Narayanan‏Verified account @random_walker 3 Feb 2018

        Arvind Narayanan Retweeted Arvind Narayanan

        In a previous thread I discussed why this isn’t happening in the context of third-party online tracking. But it's a broad problem. We need more tech-focused public interest organizations.https://twitter.com/random_walker/status/946889870114467841 …

        Arvind Narayanan added,

        Arvind NarayananVerified account @random_walker
        My team has been doing this research for six years and I’ve asked myself this question many, many times. Here are my thoughts. https://twitter.com/matthew_d_green/status/946866218962767872 …
        Show this thread
        2 replies 10 retweets 33 likes
        Show this thread
      13. Arvind Narayanan‏Verified account @random_walker 3 Feb 2018

        The wrong lesson here is that companies shouldn’t release products like the Strava heatmap because of the potential PR backlash. The right lesson is that privacy should be integrated into every stage of the product design, and involves a lot more than anonymity and opt-out.

        5 replies 49 retweets 112 likes
        Show this thread
      14. Arvind Narayanan‏Verified account @random_walker 3 Feb 2018

        Thanks @zeynep for the Op-Ed and @feamster for interesting conversations on this!

        2 replies 1 retweet 18 likes
        Show this thread
      15. Arvind Narayanan‏Verified account @random_walker 3 Feb 2018

        Finally, and most importantly, I should take voice training lessons or something to learn to speak more like the radio host, @nora3000... I sound like a robot in comparison 😃

        4 replies 1 retweet 11 likes
        Show this thread
      16. End of conversation

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