(CNN) -- Among U.S. adults who go online, 13% use Twitter -- and more than half (54%) of these people access the popular social media service with their mobile phone, according to new research from the Pew Internet and American Life Project.

The report also revealed some interesting details about the demographics of Twitter users. For instance, 25% of adult African-Americans who use the Internet are on Twitter, as are 19% of Hispanic Americans, compared with only 9% of whites.

Where you live also may affect whether you're on Twitter: About 15% of both urban and suburban U.S. adult Internet users are on Twitter, vs. only 7% of rural dwellers.

Read More