As for Digg eclipsing Slashdot, there are two arguments against. The first deals with the "wisdom of crowds." If crowds were automatically smarter than individuals, then surely it would have been selected for by social pressures and efficiency. Every organization of humans into a collective would, because of its superiority, be a democracy. Wikipedia is a good example that's a bit more Internet-related. Though certain topics have decent coverage, the entirety of the webcomics segment of Wikipedia was gutted by users who never bothered to explore the webcomic community.