I resisted Facebook until about a year ago, at which point I was in the pub with some friends, who spent an hour talking about facebook and related stuff, leaving me sat there wondering what all the fuss was about.
So, I use it now, but have the safest security settings they offer and never use it for more than keeping in touch with friends. Never use any apps or anything else that requires dishing out personal information.
What makes you think it's 'either/or', either you have a life or you use Facebook......... that's just being silly. Facebook is, like many things on the net, quite a useful tool. What do you mean by "I've got a life. A REAL life" and how do you think it differs from mine for example? I do have and use a Facebook account by the way.