The average time spent accessing Facebook via smartphone in the United States was 441 minutes in March, compared with 391 minutes via computer, according to comScore, underscoring the increasingly high-profile role of mobile in social networking.

comScore's new Mobile Metrix 2.0 report showed U.S. smartphone users spent 441 minutes per month, or 7 hours and 21 minutes, on Facebook in March. That compares with 391 minutes, or 6 hours and 31 minutes, for people who tapped into Facebook via a computer.

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