Even though I'm in IT, I don't have a Facebook account and never will. Too many privacy concerns, knowing that that company is making a mint of money by selling as much info about you as possible, and never feeling the need to know the every move of people all day, every day.
My friends and relatives that use it the most are the most boring, depressing people you would ever want to meet. I don't want to know the every move of interesting people, much less the most frequent users of Facebook. Still feel it's a fad that will eventually go the way of all fads.