"But logging out of Facebook only de-authorizes your browser from the web application, a number of cookies (including your account number) are still sent along to all requests to facebook.com. Even if you are logged out, Facebook still knows and can track every page you visit. The only solution is to delete every Facebook cookie in your browser, or to use a separate browser for Facebook interactions."
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- IIRC, in the absence of any cookies, the "Facebook Connect" button creates an identifier cookie, keeping track of you as an unknown, but specific user. Presumably, any data gathered for that cookie will be merged into your "normal" history once you log in to Facebook and they establish a "true" Facebook cookie.Sep 25, 2011
- That would definitely be the wrong thing to do. If I am logged out of Facebook, how do they know I am using the machine and not someone else?Sep 25, 2011
- , considering the amount of information they can get that way, I'd imagine they don't much mind the occasional noise from the edge case of two logged-out users sharing a machine.
I mean, if they don't intend to run some aggregation, why is the Facebook Connect button assigning you a unique ID?Sep 25, 2011
- You need a cookie for stats of visits and unique browsers.Sep 25, 2011
- ... and I'm not sure it is an edge case. I'm sure many people log in to FB from public machines. If I logged into FB from an internet café, would it paste into my profile (and my friends' tickers) all the web usage of everyone who had used that machine since someone last logged in to FB?Sep 25, 2011
- Obviously, they would not show such things in the ticker. But I would not be too surprised if it influenced advertizing data.
I am not privy to exactly what data Facebook uses for what. I am just not comfortable with the way Facebook has managed to get other sites to hand over information and browsing history.
To gather visitor stats, you don't need a persistent ID across all sites with a Facebook button, which is what the system creates.
They may be entirely on the level and only ever use it to save kittens, but given that they are deliberately building an architecture and infrastructure which can do a massive, implicit data gathering of people who don't even have a Facebook account, and given Zuckerberg's known attitude and opinions, I don't really think they have earned the benefit of doubt.Sep 25, 2011