Google's servers use similar logic, ranking Web sites according to how many other sites link to them and how lofty the referring sites are in the ranking.

FORBES: Magazine Article

The data that marketers are used to getting from Google Analytics and Adobe's Omniture software, such as the names of referring sites and time spent on site, shouldn't be part of the world of social marketing, says Shah.

FORBES: Technology

All sites also inform the person you are referring to, of your post.

FORBES: The Changing Grammar of Communicating Ideas