Rihanna, ranks number 1 on Billboard's Social 50 chart

So Rihanna made history twice in the same week, first she became the most famous  on Facebook, over taking Lady Gaga . Now RiRi also takes over the No. 1 slot on Billboard's Social 50 chart, making her the most active users on social networking sites

The chart ranks the most active artists on the world's leading social networking sites -- YouTube, Vevo, Facebook, Twitter, MySpace and iLike -- using a formula blending weekly additions of friends/fans/followers along with weekly artist page views and weekly song plays.

 Rihanna now has 41,002,000 Facebook fans while Gaga (who falls 2-5 on the Social 50) rests at 40,874,000. In the tracking week, Rihanna's fanbase grew by 650,000 Facebook fans, with Twitter (114,000) and MySpace (6,000) also showing gains. In total, she has 6,184,000 Twitter followers and 2,301,000 MySpace friends. In contrast, Lady Gaga has 11,736,000 Twitter followers and 1,639,000 MySpace friends.