The report was based on data from a survey conducted in January 2018 among a nationally representative sample of 2,002 people age 18 and older living in the United States.
Some 73% of respondents say they use YouTube, and 68% of respondents say they use Facebook.
None of the other social platforms measured by Pew in the survey are used by more than 40% of Americans.
There are major differences in social media use by age, the survey found.
Some 88% of 18-29-year-olds use social media, compared with 78% of Americans age 30-49, 64% age 50-64, and 37% age 65+.
Americans age 18-24 are significantly more likely to use platforms such as Snapchat, Instagram, and Twitter, even compared with Americans in their mid- to late-20s.
Ayaz Nanji is an independent digital strategist and a co-founder of ICW Content, a marketing agency specializing in content creation for brands and businesses. 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