Andrew Chen: "Facebook app users are potentially worth about 1% of what users on your website are worth"

I just don't see how getting users on facebook actually HURTS you. I can see how it might not help you, but not how it hurts you. ILike has apparently lost visitors to the main site... I guess that makes sense if there is nothing more to do on the main site than in the F8 app.

This article assumes that your Facebook app is designed to bring in advertising revenue. I think many Facebook apps are designed to acquire users and direct them to their main site.