Facebook has reportedly admitted tracking which sites its users visit even after they
log off, thanks to plug-ins and cookies.

Facebook, which has more than 800 million active users, also keeps close track of where millions
of non-members of the social networking site go on the web, even after they visit a webpage for any
reason only once, USA Today reported.

To do this, it relies on tracking cookie technologies similar to the controversial systems used by Google,
Adobe, Microsoft, Yahoo...