Corporate Twitter use and cost of equity capital

This paper investigates whether firms that communicate information on social media have a lower cost of equity capital. Using a hand-collected dataset comprising the full universe of all firms listed on the NYSE, AMEX and NASDAQ since the inception of Twitter, I show that firms that use Twitter have a lower cost of equity capital. Furthermore, firms that face the greatest information asymmetries; namely, smaller companies, companies with few analyst followings, and companies with the least institutional holdings, benefit particularly from tweeting financial information. For identification, I employ a difference-in-difference analysis based on the staggered adoption of Twitter, and a propensity score match (PSM) of tweeting and non-tweeting firms.