StumbleUpon looks to take a bigger step in expanding its uses. The Web discovery service added a new feature called search reviews. The new tool shows an icon beside of a link found on major search engines and other content Websites like YouTube.  The icon lets users see what sites are popular and how many thumbs up it received. For more information on the SearchReviews added to StumbleUpon, watch the full story from Reporter Kara Ratliff right here on WebProNews.