The zune phone has a terrible UI that takes so much space to convey so little information.
What if facebook is a fad? what if someone hates facebook - does the whole phone fall flat?
I'm pretty sure I need all the one click functionality and app centric approach that I get off my iPhone homescreen - I like a map to know where I'm going, a camera, stocks, weather, calendar, etc. I really could care less about having what my friends are doing pushed at me - this is my navigation tool, my notebook, my tape recorder, my camera, my phone - not just some dumb social network - my iPhone is about doing, not watching what my elementary school friends had for lunch on Facebook, no thank you.