I love FB, especially as family in Ireand can see photos of the kids, these could of course be emailed, but then there would be no banter from many different rellies adding comments.
FB has a billion users, some have have bad experiences, this is down to poor choice in friends and/or not enough understanding of internet privacy, millions use it everyday and have no problems, I haven't, and as Divegirl says, if someones annoying you, just delete them from your newsfeed.
And of course, it has the added bonus that friendships from here in cyberland have found their way into our real life, for me, I think that's great.