Source: A Portrait of Today’s Smartphone User, conducted by Frank N Magid Associates, for the Online Publishers Association, August 2012
Note 1 - Lots more data in the full presentation
Note 2 - It's frustrating that they didn't ask about social networking activities, but then the OPA are not in the business of showing how many people are using social networking sites...
Methodology: "Data comes from a nationally representative online survey of 2,540 internet users between the ages of 8 and 64. The sample is matched to the U.S. Census with regard to age and gender" Conducted from 19th - 26th March 2012