SCAMBRIDGE, MASS. — Fast Company videoblogger Robert Scoble, who has discovered in the Web a popularity which escaped him in high school, has been moderating a panel titled "Web 2.0/Web 3.0 Mashup" at MIT's EmTech conference for the past hour. There are people from Facebook, Six Apart, and Plaxo on stage with him. With no introduction, Scoble launched into a meandering conversation about data portability, online video, URIs, social TV guides, and the Olympics. An hour later, it still has no sign of going anywhere. Joseph Smarr of Plaxo talks very fast. Dave Morin of Facebook seems very tired. Sample quote: "The pace of change is not indexable from a central service." The audience appears to be stunned into stupor. Does it matter that nothing is being said? Perhaps not; perhaps the point is to show this audience of technology generalists how insubstantial the obsessions of the Valley's geek set are.