StumbleUpon, which has attracted 3.7 million consumers to its easy-to-use "thumbs up/thumbs down" ratings of Web sites and videos, said on Monday it plans to introduce a new SearchReviews feature on major Web sites.

SearchReviews are available to StumbleUpon users who have downloaded and installed the company's toolbar inside their Web browser. They will start seeing tiny colored icons alongside links their friends have rated.

These ratings will begin running on nine of the Web's most popular Web sites on Tuesday, including any links friends have reviewed on search sites from Google, Yahoo, MSN, AOL or Ask. They also will appear on Google News, Yahoo News, Flickr photos, the Wikipedia online encyclopedia and YouTube videos.

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