as long as youre stable i wouldnt worry about it. i have facebook but i dont use it for anything just to keep up on what friends or family are doing, but i see neices putting way too much about their personal lives on there and i am embarrassed for them. so maybe you could ask your friends and family who know you are bp to let you know if you are getting out of hand and not post during times you are manic. i know i tend to write very long, informative emails to people during those times and become very embarrased afterward.