Facebook Replaces Email, Instant Messaging Online

How Americans spend their time online has shifted dramatically over the past 12 months, according to a new report.

Social networks dominated by Facebook now account for 22.7 percent of the hours spent in front of a computer, a leap of 43 percent over last year's figures.

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Leslie Meredith is a contributor to Live Science. She has a bachelor's degree from UCLA in psychology and has directed tourism and ski publications for the Salt Lake Visitor & Convention Bureau and managed promotions and events for Sunset Magazine.