I guess he is since he’s the most re-tweeted person in the land.  And almost 42K people following him on Twitter.  And we all know who he is, sort of.  But have you been to his website?  I hadn’t until it dawned on me what a crowd this guy has attracted.  A wonderful aggregator of information.  Not a new concept (OriginalSignal and Popurls), but clearly improved version of a good concept.  A very interesting alternative to Google on some levels.