President Obama will host the first White House Twitter town hall next week, an event announced today on (of course) Twitter. On July 6, the president will answer questions tweeted to #AskObama live from the White House via webcast. Twitter co-founder Jack Dorsey will moderate, and Twitter will use its own curation methods to choose the questions. Some portion of the live audience will be drawn from the 2.25 million people who follow @whitehouse — making the event not just a townhall but a ‘Tweetup.’ Those visitors won’t ask in-person questions, but White House Director of New Media Macon Phillips...