Nearly one in three adult Web users in the U.S. upload or post videos online, compared with 14% in 2009, the Pew Internet & American Life Project has found in a report. Also, 78% of adult Web users said they watch online videos, up from 69% four years ago. "As the online video culture grows -- fueled by video-sharing sites, mobile phones and online social networking -- posting videos online is becoming a mainstream online behavior," said Kristen Purcell, associate director of research at the Pew project.

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