Back in August of 2013 I posted about a PEW study measuring adult use of the internet. Well recently the Wall Street Journal released a study of how Twitter is attempting to better aim it's ads based on the demographics of its users. As it turns out Twitter's user base is more racially diverse than U.S. Internet users as a whole. Blacks, Hispanics and Asian users account for 41% of Twitter's 54 million U.S. users, compared with 34% of the users of rival Facebook and 33% of all U.S. Internet users, according to Pew Research Center's Internet and American Life Project.
The graphic below allows some comparisons between the various prominent social media and their user demographics.