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 a number more. Upon searching, you can also click on the link for each of the pages and find out what people are saying about the given URL. So if you have your own start up, this is a good tool to gauge the success of your viral campaign.
Socialscan.com In Their Own Words
“Webmaster tool for checking a website link popularity among well known social sites.”
Why Socialscan.com It Might Be A Killer
By giving a different slant on web traffic information and allowing webmasters to gain the buzz surrounding their site, Socialscan should become a popular research tool.
Some Questions About Socialscan.com
Will they be adding Facebook and other similar sites? This would be a very useful addition to an already useful tool but may require more work on the backend. 
