Internet and social media contribute to the transformation of the process of selection and circulation of content. This paper investigates if Twitter users assume the role of gatekeepers when recommending content to their followers. Through the techniques of content analysis, we analyzed the links associated to #Arde-Valencia and #25N, two viral hashtags in Spain about forest fires in Valencia and the Parliament election in Catalonia in 2012. The results question the potential of users as curators of content, because they tend to reproduce the media agenda and link news without following any strategy.