Will Facebook be at Apple’s big iPhone announcement tomorrow? Robert Scoble thinks so. And Scoble thinks Facebook and Apple are doing an integration deal along the lines of how Apple is integrating Twitter, but more so. He doesn’t have any scoop, just a logical argument. While an Apple-Facebook hookup would help guarantee Apple social relevance and help Facebook lock in users, the two haven’t been friendly for some time. Their ambitions could be mutually supportive, but tricky things like app stores and who gets a commission on transactions might be hard to work out. I expect to see a Facebook iPad app, but would be surprised to see deep integration. We’ll see soon enough.