Socialscan.com – Search URL Popularity on Social Sites
For webmasters or anyone else interested in knowing the popularity of any given URL across a broad cross-section of social networking sites check out SocialScan. Simply go to the site, enter the URL you are interested in finding out the popularity of and receive information about the number of hits it has on each site. Some of the more well-know sites included are: Del.icio.us, Digg, Stumbleupon, Technorati, Myweb, Reddit, Diigo, plus...