You shouldn't have to get one if you don't want to, and they should understand and work around that if they really want you there.
I have it, and it's not as much of a timesink that people claim, I just have it on in the background as one of my 5 tabs, that way I can quickly respond to anything new my friends do. There's really not much to do on it except the idea that you're keeping up with your friends, that isn't that bad. It has helped me stay in touch with my old and internet friends. Plus you get the sadistic enjoyment of rejecting people you hate's friend requests, because many people think you should add everyone you've ever met, regardless of how you feel.
I have it, and it's not as much of a timesink that people claim, I just have it on in the background as one of my 5 tabs, that way I can quickly respond to anything new my friends do. There's really not much to do on it except the idea that you're keeping up with your friends, that isn't that bad. It has helped me stay in touch with my old and internet friends. Plus you get the sadistic enjoyment of rejecting people you hate's friend requests, because many people think you should add everyone you've ever met, regardless of how you feel.