Competing principals 2.0? : the impact of Facebook in the 2013 selection of the Italian Head of State

Motivated by the literature on ‘competing principals’, this article studies the effect of interactive social networking sites on the behavior of politicians. For this purpose, 12,455 comments posted on the Facebook walls of 423 Italian MPs have been analyzed to assess whether Facebook played a role in the selection of the Italian Head of State in 2013, enhancing responsiveness. The statistical analysis reveals that the pressure exerted through social media did not affect MPs’ propensity to express public dissent over the party line, which is instead affected by more traditional ‘principals’ and factors: seniority, primary elections, and factional membership.