Unsocial is a social network for business that's designed to include location services (like Foursquare) and the networking aspects of LinkedIn without all the Mafia Wars silliness.
What I wonder is if there is room for another platform. I get invitations to other "for business" platforms periodically, and I tend to ignore them. How many online channels can one reasonably manage? On the other hand, neither FB or LI is the killer app, so who knows - this just might work.