“Leaders or Followers? Measuring Political Responsiveness in the U.S. Congress Using Social Media Data.” (with Richard Bonneau, Patrick Egan, John T. Jost, Jonathan Nagler and Joshua Tucker) Working Paper. URL: http://pablobarbera.com/static/barbera_twitter_responsiveness.pdf
“Social Media and Political Communication: A survey of Twitter users during the 2013 Italian general election”. (with with Cristian Vaccari, Augusto Valeriani, Richard Bonneau, John T. Jost, Jonathan Nagler, and Joshua Tucker.) Italian Political Science Review, 2013, 3, 381-410. URL: http://www.rivisteweb.it/doi/10.1426/75245