The Facebook App Economy: Revival Time?

From what I can tell, Facebook's privacy tempest has delayed the formation of what I expected to be another goldrush. And no, I'm not talking about publishers who have incorporated "Likes". I'm talking about entirely new or re-formulated web and mobile services that leverage unique data feeds from Facebook so as to bring entirely new value into the world. We've seen a fair amount of this from the Twitter ecosystem (though still and all, not as much as we might see soon). In the case of Facebook, however, I expected that by now we'd have seen a bunch of super cool services. But so far, none.
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