Google's YouTube, the biggest video Web site, added a feature that lets users and advertisers track viewers, part of an effort to attract...

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Google’s YouTube, the biggest video Web site, added a feature that lets users and advertisers track viewers, part of an effort to attract more ad spending.

YouTube Insight shows users the geographic regions where their videos are the most popular and the days of the week they get the most views, YouTube said Thursday. The software is free to anyone with a YouTube account.

“With this information, you can concentrate on creating compelling new content that appeals to your target audiences and post these videos on days you know these viewers are on the site,” YouTube said.

Since buying YouTube for $1.65 billion in 2006, Google has tried to lure advertisers to the site. Last year, it started showing ads in the bottom portion of some videos, sharing the revenue with the clips’ creators. The videos come from media companies such as Time Warner, as well as independent directors and musicians.

Of the 9.8 billion videos viewed online in the U.S. in January, one-third were from YouTube, according to research firm ComScore. Revenue from the site may jump sixfold to about $1.36 billion in 2011 from an estimated $205 million this year, according to a November note from Credit Suisse analyst Heath Terry in New York.

YouTube also rents out its home page to marketers for daylong campaigns and allows other Web sites to run YouTube videos and related ads alongside articles.

Google is counting on the revenue to lessen its dependence on search ads, which generated almost all of its $16.6 billion in 2007 sales.