Well, to be honest, Facebook really does intrude a lot on privacy. I've been using Facebook for around 8 years or so, but recently they've been making "friend suggestions" of people who are within my neighborhood and also any friend of a person who logged into my computer. I assume that these people will also be getting the same suggestions as I am. Even people I see on the bus while going to work is getting suggested.
I'm not big on privacy, but that's just plain creepy. I've deactivated ever since then.