A new look at the demographic breakdown of Twitter users.

Twitter Use 2012, from the Pew Research Center’s Internet & American Life project, provides a demographic breakdown of the 15 percent of online Americans who use Twitter. This percentage is up only slightly from a year ago (when it was 13 percent), but what has changed “dramatically,” according to Pew, is the percentage of online 18-24-year-olds using the platform, both generally and on a typical day. Almost a third of this cohort now uses Twitter, up from 18 percent in May 2011—perhaps not surprising when you consider that Justin Bieber now has almost 23 million Twitter followers worldwide and Rihanna has 20 million. The percentage of adult Millennials using the service is now almost double that of Gen Xers who use it.