Nearly three-quarters (72%) of online US adults were using social networking sites as of May 2013, up from 67% in late 2012, according to a recent report from the Pew Research Center's Internet and American Life Project.

When Pew first started asking about social networking sites in February 2005, just 8% of online adults said they used social networks.

Social networking site use is prevalent for Internet users from a wide range of demographic groups. Not surprisingly, younger adults are heavily represented, but social networking continues to grow in popularity for older adults as well.

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image of Ayaz Nanji

Ayaz Nanji is a digital strategist and a co-founder of ICW Media, a marketing agency specializing in content and social media services for tech firms. He is also a research writer for MarketingProfs. He has worked for Google/YouTube, the Travel Channel, AOL, and the New York Times.

LinkedIn: Ayaz Nanji

Twitter: @ayaznanji