Edit: To clarify, I signed up for facebook in 2004 because it offered simple social planning and sharing. Today, I think FB's photo and event apps are very well executed.
Everything else is just fluff. Fluff that, if not disabled, can spread information about you without your knowledge.
I understand they want to make money but they seem to be quite underhanded about how they use (or mis-use) their users' information.
Yes, "Dark Stalking on Facebook" ~ http://pjf.id.au/blog/?position=590 Paul has also commented on the latest changes here ~ http://pjf.id.au/blog/?position=604
I just can't trust them. They've proven it over and over.
So I have to be extremely selective with what I share there, and outright lie in some cases.
It's a dysfunctional relationship, and it won't last.
They're in for crash.
Also, some of the relevant Javascript is here: http://static.ak.fbcdn.net/rsrc.php/z3RA8/hash/273u6o5s.js