Facebook has made allot of changes to its privacy arrangements so you need to go through all of the privacy settings (there was several pages last time I checked) and even then it is not a private thing with friends. Make sure that you don't write anything you don't want future/current employers/ees to see.
Cookie tracks users across internet even when not logged in to the site.
Good website and clean as well. But too many negative comments for no apparent reasons at all. Please submit your thoughts to facebook.com staff and not over here as this is a totally different issue all together.