The Pew Center for Excellence in Journalism has studied the differences between the stories reported on by traditional media sources and by the new social media -- like Twitter and blogs. The study has been widely publicized (both in the old and the new media) including by The Guardian and MSNBC. The study notes that the new media is totally dependent on the traditional media, linking to traditional media sources in 99% of posts -- and to either the BBC, CNN, The New York Times, or The Washington Post in a full 80% of cases. The study also notes that users of social media outlets have short attention spans, with a majority of lead stories on blogs gone within three days.