social network
noun
1
: a network of individuals (such as friends, acquaintances, and coworkers) connected by interpersonal relationships
2
: an online service or site through which people create and maintain interpersonal relationships
And millions of people have become comfortable using smart-phones to share information about themselves, via mobile apps that access social networks such as Facebook and Twitter.—The Economist
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Merriam-Webster unabridged
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