Owen Thomas / Valleywag:

Mark Zuckerberg SXSW keynote  —  AUSTIN, TX — 1:53 p.m. Central Time: Facebook PR director Brandee Barker gave me this exclusive scoop: CEO Mark Zuckerberg, who’s due to take the stage for his SXSW Interactive keynote in minutes, is not wearing his famous Adidas flip-flops.