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especially if that someone is Arrington, who you know is going to make it a personal quest to destroy you.

But I doubt the vast majority of Farmville and Mafia Wars read/care about TechCrunch.

they don't, but facebook does, and if techcrunch makes a big deal about them profiting from this, it won't take long for them to intervene

Facebook caring what Arrington thinks? On what planet?

They properly didn't know whom Arrington is. Most people don't care.