(economist.com): Online social networks are changing the way people communicate, work and play, and mostly for the better. Although Facebook is the world’s biggest social network, there are a number of other globetrotting sites, such as MySpace, which concentrates on music and entertainment; LinkedIn, which targets career-minded professionals; and Twitter, a networking service that lets members send out short, 140-character messages called “tweets”. All of these appear in a ranking of the world’s most popular networks by total monthly web visits.
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