This is an article about the fact that there are - broadly speaking - two types of users: early adopters and mainstream users. Because the former group is small, and the latter group is large, it’ll be platforms like Facebook that will assimilate early adopter technologies like Twitter, Friendfeed, RSS, etc., instead of those services being successful on their own, despite large followings among early adopters. I think especially @Eric and @Neil will agree with the thoughts behind this article.