Though it will be interesting to see how they manage identity transfer -- perhaps multifacet identity management may be the way to go. You experienced this when you tried to get your students onto...was it a Facebook group, and became the creepy math teacher (your words very badly paraphrased back atchya!)

Do I really want my Facebook (with my real name attached) linked to my Livejournal (where I refuse to put up my real name or any major identifying pieces of information). Will that informal, self-maintained id management go out the window, or will the OS software allow me to control who can see what, who knows what, who can follow which links where?

Questions, glorious questions....

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