[mvzink]

Aha, I didn't understand at all before your edit (no offense :P), and I think you have a good point, but it is actually on the "pro" side for approaches like Winer's: the hypothetical "Twitter-like ecosystem" is targeting now, just like Twitter (less the realtime-related problems, sadly), but is set up to continue targeting "now" once nobody uses Twitter, even during the transition period!