Twitter joins Washington’s influence economy, forms PAChttp://www.washingtonpost.com/business/technology/twitter-joins-washingtons-influence-economy-forms-pac/2013/08/09/8af1a97a-0124-11e3-96a8-d3b921c0924a_story.html by Lightning • 13 years ago 3 0 13 years agoWAwashingtonpost.com