The Next Web writes, Now that the amazing email client Sparrow has been acquired by Google, competitors are trying to move in and pick up some of its users. Sparrow’s team won’t be adding any new features, but one company, Postbox, is. The company decided to buy a promoted tweet to try and lure some folks to leave Sparrow: The Sparrow Team is moving to Google and they will no longer be developing the Sparrow email client – postbox-inc.com/blog/entry/fir… — Postbox (@Postbox) July 20, 2012 In all of its promoted glory: It’s a pretty wise use of marketing dollars, I have to say. This...