Rihanna & Justin BieberDid you recommend a Rihanna song on Twitter without buying her latest album, 'Loud'? Billboard now cares.

In an effort to better document how music is listened to and received, the music industry magazine bellwether recently introduced the Social 50, a new chart that tracks the most popular artists on all social networking websites.

While most Billboard charts rank artists based on retail sales provided by Nielsen SoundScan, the new chart will attempt to track the behavior and actions of average fans, looking at everything from artist page views on MySpace to song plays on YouTube.

"The Social 50 provides a weekly snapshot of the artists that music fans engage with the most in the social arena, which in today's world is a significant validation of their investment in an act," says Billboard Chart Director Silvio Pietroluongo.