Rihanna & Chris Brown Gain Twitter, Facebook Fans After Release of Remixes

It is no surprise that both Rihanna and Chris Brown both made moves on Billboard's Social 50 chart this week after releasing two new collaborations, with Chris Brown being featured on a remix of Rihanna's "Birthday Cake" and Rihanna appearing on a remix of Brown's "Turn Up The Music." Rihanna rises 4-3 on the tally, while Brown flies 10-5.

The Social 50 chart ranks the most popular artists on YouTube, Vevo, Facebook, Twitter, MySpace and iLike, using a formula that blends weekly additions of friends/fans/followers along with weekly artist page views and weekly song plays.

After rumors surrounding the two artists had been furiously circulating over the past few weeks, on Feb. 20 the public saw its first evidence of contact between Chris Brown and Rihanna as Brown tweeted "HAPPY BIRTHDAY ROBYN," to which the singer, born Robyn Fenty replied, "Thanks!"

The most-viewed "Birthday Cake" remix on YouTube has garnered over 4 million views and elicited over 11,000 comments. All of the buzz generated a week-over-week gain of 427,000 Twitter followers for Rihanna (in the week ending Feb. 27) and a gain of 483,000 Facebook fans. Overall, she earned a 19% increase in her overall follower base.

Chris Brown, meanwhile, snared a 28% increase in Facebook fans and a 23% jump in views to his official YouTube channel as well as a 23% climb in Twitter followers.

Meanwhile Bow Wow makes his Social 50 debut at No. 33 after receiving nearly 1,476,000 Vevo views this past week. Bow Wow's video for "Sweat" featuring Lil Wayne has received nearly 1,650,000 views. The track is from his upcoming album "Underrated" (out March 13) -- his first release for Cash Money after signing with the label in 2009. A tour is scheduled to launch later this year.

Other notable chart movements include Whitney Houston's drop from No. 2 to No. 12 after experien! cing a 7 0% decline in YouTube video views and a 40% decline in Facebook fan acquisition over this past week. A drop on the tally was expected, following the surge of social activity following her passing on Feb. 11.

As for the rest of the top 10 this week, Adele holds at No. 1 while birthday boy Justin Bieber climbs 6-2. The latter artist turned 18 on March 1. Nicki Minaj falls a slot to No. 4, Michael Jackson is also down a rung to No. 6 and David Guetta is stationary at No. 7. LMFAO shuffles 13-8, Katy Perry is steady at No. 9 and Eminem rounds out the top 10, up one position to No. 10.