I don't see the issue here.  Anyone who beats Facebook is going to have to offer nearly all of Facebook's features and some killer-app features of its own.  So any Facebook-killer will make it similarly easy to integrate a FBKiller-Connect feature.<p>And the ramp up of any Facebook-Killer is going to be months or years.  In that intervening few years, people will be dual-networked: they'll be using the new network with their friends who have the new network, and they'll be using Facebook for the friends that haven't switched or for legacy features (Farmville), sort of like now, where many people have both a Facebook and a MySpace.<p>And given the existing fundamental lock-in of the network effects, I don't think Facebook Connect is the largest hurdle someone plotting a Facebook-Killer has to overcome.