We're definitely using Hull for an upcoming product feature (public voting for event speaker proposals).
I added PushUp Social in the related links. It's similar, but for the less tech savvy.
@koenigst - you should receive an email each time your username is mentioned. Please let me know if you don't get this one.
You're absolutely right about identity tracking and desperate systems of information. I'm particularly familiar with this in the mobile gaming space coming from PlayHaven.
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