You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more
Your keystrokes are recorded by third parties as soon as you type them, even if you never submit the form. If you accidentally copy-paste something, that's recorded too.
Even if you're visiting an HTTPS site, your data might be sent over the network in the clear! Not a failure of HTTPS --- it's because the 3rd party doesn't enable HTTPS when the publisher logs in to replay your session.pic.twitter.com/ZlL1ireviO
This is our latest study using our open-source web privacy measurement tool OpenWPM. https://github.com/citp/OpenWPM At least 20 other studies have used it, both by us and many others: https://webtransparency.cs.princeton.edu/webcensus/index.html#Users … Hope you find it useful!
This was just retweeted via @ProPublica. I don't understand the full context of this. Is this in reference to any website with a search field, or are you describing a virus? 
Thank you so much for this kind of research. This is messed up in so many ways. All the best for 2013.
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