Upworthy May Really Bring the Liberal Bias to the Millennials on the W

This week, Politico media reporter Mackenzie Weinger revealed a powerful new tool in the Left’s social-media sandbox: the website Upworthy.com, founded in March 2012 by former MoveOn executive director Eli Pariser and former Onion managing editor Chris Koechley (also a MoveOn veteran). Touting itself as “social media with a mission,” Upworthy has “drawn big traffic – about 53 million…