I love my facebook. I keep in touch with long lost family members and friends from years ago. I don't mind others grabbing my friends or family. example here to explain a bit more...
my brother has had no contact with his oldest daughter since she was around 8 or 9. none of our family could get in touch with her. facebook has brought us all together with the exception of my brother and his newer family and that is fine too. I love my niece and my other cousins are meeting her and showing her family love now.

I think it is great! you can always make your stuff private.