None of that stuff is very interesting (for the purpose of "making good things happen") -- most of it is primarily intended for other purposes (basically "web publishing" and/or promotion) than what the omidyar.net was (IMHO) intended for (collaborative "decision making"). Of course such applications can be used for promotional marketing or something like that -- but that's rather ordinary and nothing special (nickel and dime stuff).

What will make communities stand apart (besides being focused on something) will be the standards of quality applied. Where no qualitative standards are applied, it will be difficult to differentiate one site from another -- and therefore all will become unrecognizable from the din of a mass of murky misinformation glazed over with 2.0 whitewash.

:/ nmw