This page shows information about a web page, and who has bookmarked it and when

http://www.authorati.com/

These are the public entries for this link:

• Authorati-Home
  Portable ratings system that allows readers to rate. In addition, the tags you specify are assigned an authority rating which helps build your reputation and visibility online. ...It takes less than a minute to set up your very own Authorati page.<br>
  By ycc2106 in tools with add-ons blogging rating system tools voting

NB: The average rating is calculated using the rating for both public and private entries for this link.