The  data may not be particularly surprising, but it sure is impressive:  fully 91% of online U.S. adults access social media in a typical month,  according to a new study by Experian Simmons.
That's 129 million people,  or 41.37% of the total U.S. population of 311.8 million; the figure  doesn't include millions of people under the age of 18 who use social  media. As one might expect,
among adults ages 18-24, the proportion  using social media in a given month is 98% (which has me wondering about  the elusive 2%).
It's  not news that young adults are fairly enthralled by
social media. The  really interesting trend is the rapid increase in usage among older  adults: 82% of online adults ages 55-64 use social media in a typical  month, according to Experian Simmons, and
roughly three quarters of  online adults ages 65+. 
So  what are Americans using social media for? 46% of all online adults say  they use social media to communicate with their friends, up
from 32% in  2009. Among online adults who have a brother or sister, 27% say they  use social media to stay in touch with their siblings, up from 15% in  2009. Online adults also use it to stay in
touch with their children:  here the proportion increased from 6% of online adults with children in  2009 to 18% today. 14% of adult children say they use social media to  communicate with their
parents, up from 5% in 2009.
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The  Experian Simmons data also included some interesting findings on ethnic  groups using social media, with possible implications for marketing and
advertising. For example, 30% of Hispanic consumers who use social  media say they follow their favorite brands and companies on social  media sites, compared to 18% of non-Hispanic social media
users.  Meanwhile 19% of Hispanic adults who use social media say they're more  likely to buy products advertised there, compared with 8% of  non-Hispanic social media users.