Since the study principally focused on Twitter, I’m surprised that the authors did not reference the empirical study that came out last year on the behavior of Twitter users after the 8.8 magnitude earthquake in Chile. The study shows that about 95% of tweets related to confirmed reports validated that information. In contrast only 0.03% of tweets denied the validity of these true cases. Interestingly, the results also show that “the number of tweets that deny information becomes much larger when the information corresponds to a false rumor.” In fact, about 50% of tweets will deny the validity of false reports. This means it may very well be posible to detect rumors by using aggregate analysis on tweets.