I know this is commonplace on desktops, but it really freaks me out on my phone. Especially with Facebook's track record of, say, going through my contacts and adding the facebook "email" (which nobody in their right mind would use over a real email system), consistently (but technically legally) violating my privacy, and enabling opt-out "features" that are usually unasked for and unwanted.

In short, Facebook is the last app I would want auto-updating.

EDIT: I realize you can refuse the update, but what's the point? It doesn't look like you can see what has changed.