What does everyone think of Web2.0's sociality(eg del.icio.us, digg, flickr, etc) in comparison to Anonymous-based systems(4-ch, 4chan, iichan, etc)?

IMHO, sociality does exactly the opposite of one of the goals of Anonymous-based systems, and that is counter vanity. The sociality of it all means that it's designed to create cliques, social groups, and, inevitably, stereotypes. Which are bad, of course.