You should probably not blindly follow your friends off a building. Or a bridge for that matter. But if you do follow them off a bridge, learn how to dive and make sure they aren’t directly below you.
I’m using Google+ now, and it’s quite nice. I think it has the ability to rise up as a decent social network. It integrates quite well with Gmail. And it’s by invite only! So you can be sure that only people with friends are on it at the moment.