Tim is right on.
FB have taken the spying into personal info to new heights and as a result Google and other sites are following FB's lead, to become worse spies.
Trying to avoid this extreme net spying has become a significant task, I've even increased my use of fake IDs for my net activities.
This spying becomes even more serious when we realize they collect some incorrect info and keep it forever.
Almost all web sites, including this one, push using these...