Harry Webber is back. Actually, he never really left. Webber did, however, take a hiatus from blogging. According to Webber, his blog’s URL eventually lapsed and Earthlink scrubbed the content from its server. Now MadisonAveNew.com has returned to the Internet—on the same weekend that Omnicom and Publicis Groupe decided to disrupt the industry. Time will tell if Webber winds up creating more change than Messrs. John Wren and Maurice Lévy.