1, 2, 3: These are iPhone questions. You'd probably do better asking them at
iPhone Forum - iPhone Forum Index
4: Facebook is now being pushed onto T-Mobile users' Blackberrys without even asking the users. It definitely works. As for YouTube, results are mixed. Do a search in the Media forum here for YouTube and you'll see lots of discussion about that. I believe the next Blackberry OS release, due out any day now, is going to allow YouTube functionality. One thing that doesn't work is any kind of Flash video. No Blackberry support for Flash. That may come with the release of a future Blackberry model, but for now there's nothing.