You kind of did, when you signed up.
> And really you can't opt out of Facebook. I'm not on Facebook but there are a lot of drawbacks in my offline world. No party invitations, no updates from my friends, people stop talking to you, because you're not on Facebook. So it has real life implications.
Oh yes you can. Facebook is just about the worst place for actually expanding your social life.
When I was there, when I would make a post, it often felt like I was talking to everyone and no one at the same time.