Facebook stirred up privacy concerns when it came out that its “Like” and “Share” buttons appearing all over the web actually report your visits back to Facebook servers.
Now Facebook engineering director Arturo Bejar has shared what personal information the company retains with its tracking cookies, as reported by USA Today.
When you’re logged in, Facebook will keep a timestamped list of the URLs you visit and pair it with your name, list of friends, Facebook preferences, email address, IP address, screen resolution, operating system, and browser.
When you’re logged out, it captures everything except your name, list of friends, and Facebook preferences. Instead, it uses a unique alphanumeric identifier to track you
