I've always loved to watch Mark Cuban dance — but Tuesday night I got to see the billionaire booty-shaker up close. The venue: PureVolume Ranch in Austin, Texas. The occasion: The Bigg Digg Shindigg, South by Southwest Interactive's closing party. "You guys always picked the worst photos of me," Cuban said. Mark, as I said at Sunday's panel on gossip, I live to serve. Digg packed PureVolume's dance floor and backyard tents with hundreds of partygoers. Besides Cuban, Moby was there, as were Digg CEO Jay Adelson and cofounder Kevin Rose, iLike CEO Ali Partovi, StumbleUpon's Garrett Camp, and Automattic's Matt Mullenweg. RealNetworks CEO Rob Glaser had just flown in from Florida on a private jet. But for me the most interesting person was newly hired Digger Aubrey Sabala, who put the party together in three days — after Digg had given up on the idea.