Underscoring the importance of online video as a marketing tool for retailers, 62% of U.S. adult Internet users watch videos on YouTube and other video-sharing web sites, up from 33% in late 2006, the Pew Research Center says in a recent report.

The report also notes that viewing content on video-sharing sites has grown most sharply among younger Internet users since last year:

* Among Internet users 18 to 29 years old, 89% watch videos on video-sharing sites, up from 72% in 2008.
* Among Internet users 30 to 49 years old, 67% view content on video-sharing sites, up from 58% in 2008.
* Among Internet users 50 to 64 years old, 41% view content on video-sharing sites, up from 34% in 2008.
* Among Internet uses 65 and older, 27% view content on video-sharing sites, up from 19% in 2008.

The report, The Audience for Online Video-Sharing Shoots Up, is based on a survey by the Pew Internet & American Life Project conducted from March 26 to April 29.

The report also notes that, among people who access the Internet with wireless devices, 71% visit video-sharing sites, compared to 38% of people who don’t access the web with wireless devices.