This is going to sound cynical, but I will not trust a company that has the ability to lock me in with my online identity. Just because "current" management respects privacy doesn't mean future management won't sell me up the river.

The setup would have to remove all power a company has over my data, and I haven't seen a system proposed that would do that other than Diaspora. However I have zero faith in them being able to actually deliver as they've shown that they just don't understand how to deliver an open source product of this nature..