Survey: nearly 40% of US adults, and ~50% of those aged 18 to 29, participate in an online community; social media is the primary venue for online communities (Pew Research Center)

Pew Research Center: Survey: nearly 40% of US adults, and ~50% of those aged 18 to 29, participate in an online community; social media is the primary venue for online communities — Nearly 4 in 10 U.S. adults - including about half of those 18 to 29 - are part of an online community