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Zynga are an extreme 'yes' example.

I have experience with some FB apps, mainly just app versions of websites. These were not monetized(by me at least).

Thanks. Zynga are the exception rather than the rule. I don't expect my app to go viral like Farmville (but I wouldn't mind if it did!).

I've already been all through FB's dev website, but wanted to get some feedback from real users.

Thanks again for the input.