Both points seem valid... is there a way to engage both? Could notes / tweets / blogs be written during the conference but not posted until after? That way you still have the spontaneity but there is also less disruption of the conference? Could people doing such be asked to sit in the back or in assigned areas, so as not to disrupt the experience for audience members not doing so? It seems there must be some way for cooperation and respect for each other to make the best of both options possible...

-Scribblemethis