I'd say A, though I wouldn't be surprised if Facebook were working on something similar as we speak.

B meanwhile, just bothers me (I wouldn't want to work under such circumstances), but perhaps there is a market for such a thing. If I'm not mistaken, ODesk has a similar, Big Brothery package of their own....check what theirs does, and see if you can improve it.

I can't comment much on C, so I won't.