I think it’s a migration more than a desertion. Twitter was once the playground of techies, college kids, and activists. Now, I am seeing more traction from different groups. Talk radio junkies, sports fans, and the culprit for lower activity — big brands are now commonplace. The original users have no patience for the deluge of ads and sponsored tweets. They scoff at that stuff, just like they did when soccer moms took over Facebook. It’s less of a communcation tool and more of a destination for shared-experience events like The Super Bowl, Oscars, Tony’s, Grammy’s, etc. The newer users have more disposable income so I wouldn’t be surprised if it’s an orchestrated displacement of users.