I'm not a web expert, nor am I the paranoid type... but should QuitFacebook.com, who has privacy concerns against Facebook, be tracking its visitors with cookies?
I found these in Firefox's cookies.
In case you're wondering what they do:
- __utmz tracks where a visitor came from (search engine, search keyword, link)
- __utma tracks each user's amount of visits, first, last visit.
- __utmb and __utmc are used to track when a visit starts and ends to some decent time resolution (c expires quickly). If you look at cookie state changes (e.g. using firecookie), you will see these change regularly.
- __utmv is used for user-custom variables in Analytics
Why would they care where you come from? Or how often you visit their site? Hmmm...?