Last reviewed:December 2019
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Websites and applications (apps) for content sharing and collaboration among communities of users online. The term encompasses social networks, microblogs, open-content repositories, photo or video sharing, messaging apps, social gaming, and virtual worlds among diverse other offerings (see illustration). They represent a leading means of communication in the twenty-first century. Some of the best known social media sites are Facebook, Instagram, Twitter, Tumblr, and Snapchat. Facebook alone has about 2.4 billion active users and Instagram has more than 50 billion shared photos. See also: Cellphone camera; Digital photography; Internet; Virtual reality; World Wide Web
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