I spent ages trying to figure out why I couldn’t add my FBML Facebook App as a tab. I realised it was because my “Tab URL” in my Application Settings was blank. It’s annoying when hours of wasted time can come down to a single character. In this case, the answer is a question…….mark.
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I know.. XFBML is nicer, but unfortunately, until they implement iFrames without the user having to click something to pull it from the server, I’m gonna stick with FBML for tabs.