I like Facebook somewhat, but I don't trust Facebook. I do trust Google (why, I don't know!) the UI is simple, it's alot easier to post/share things with your circles (groups/lists on FB). I can see it being easier to control than FB when using it as a personal sales tool (good for pre-interview screening if you do it right).
I think Google have cracked their implementation of a social network with this one. Buzz was a disaster and I removed myself from it after a few days using it as the permissions on who read what etc was f@cked. Wave, was more of a collaboration tool than social network, and Orkut? WTF is Orkut?!
If anyone can't signup through the link above and wants an invite PM me your gmail address and I'll send an invite (can take up to 12 hours apparently).
EDIT: It can also link with twitter, linkedin, Facebook, Flickr etc etc so you can have them all in one place. You can't manage them from there yet though, just link to them. Need a proper look at what that means tomorrow.