iPhone, for all the jesusness it has, is definitely not a social phone. The apps’s access to the network and the outside world is too crippled to allow really interesting real-time social things. Sure, it can do Facebook apps but until sync services come into full effect and actually deliver over the air sync and data push nothing is going to happen on that side.
Android, on the other hand, is everything iPhone is not. It’s open, allows full network side and proximity networks. Or will, somewhere after 1.0.
Google’s decision to ship minimal bluetooth and no xmpp on 1.0 makes sense from a platform engineering standpoint but kills a lot of the launch buzz for 1.0. No flash mobs, no meme p2p, no real life mmorg.