The Pew Research Center has released Social Media Usage: 2005-2015.
Here's an excerpt:
Nearly two-thirds of American adults (65%) use social networking sites, up from 7% when Pew Research Center began systematically tracking social media usage in 2005. Pew Research reports have documented in great detail how the rise of social media has affected such things as work, politics and political deliberation, communications patterns around the globe, as well as the way people get and share information about health, civic life, news consumption, communities, teenage life, parenting, dating and even people's level of stress.
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