Justin Bieber Returns to Social 50 Summit, Lady Gaga Slips to No. 4

Baby, Baby, NO: Justin Bieber Says 'None of It Is True'

After six weeks at No. 1, Lady Gaga drops to No. 4, handing the Social 50 crown back to Justin Bieber (3-1). As the frenzy around the release of her album "Born This Way" calms, she saw declines in plays (-32%), views (-60%) and fans (-15%) across all monitored social networks and music outlets. Meanwhile, the Biebs saw an increase in YouTube views (15%), perhaps due to taking home Collaborative Video of the Year at the CMT Music Awards (June 8). Months back, he worked with Rascal Flatts on the ballad "That Should Be Me" and since the video debuted, it has garnered well over 19 million YouTube views.

Justin Bieber, Arcade Fire, LCD Soundsystem Among Webby Award Winners

This week, YouTube star Christina Grimmie (No. 32) gains the highest re-entry. Between two new YouTube video blogs, she pulled in 716,000 views, respectively (a 181% week-to-week increase). At midnight on June 14, her first album "Find Me" was released to iTunes. For fans looking to buy a physical disc, you will have to catch Grimmie on tour with Selena Gomez this summer, starting July 28, where she will be selling copies at her merch booth.

The Social 50 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.

Rock band the Script makes its debut at No. 41. While on a world tour, they stopped by NBC's "Today Show" on June 10 to promote their latest album "Science & Faith." This appearance, as well as iTunes selecting their release for a "Great Albums of 2011" sale, contributed to an 80% increase in overall week-to-week views. In July and August, residents of Ireland and the UK will may get a chance to see The Script play live, as the band finished its tour.

Another notable entry (No. 48) comes with Skrillex, an LA-based house/dubstep producer and former frontman of the rockband From First To Last. In releasing a remix of the song "Cinema" by Italian DJ and electronic house producer Benny Bennassi (June 9), the act earned 91,000 YouTube views, respectively (a 181% week-to-week increase). On June 21, Skrillex will be releasing a seven song EP titled "Scary Monsters and Nice Sprites."

Rapper Pitbull breaks into the Social 50 top ten, moving 15-8 with a 160% explosion in YouTube views. On June 6, he premiered the single "Rain Over Me" featuring Latin star Marc Anthony, which has since gained 118,000 YouTube views. The following week, the song was also featured on a promotion on the song identification service SoundHound.

Watch: Pitbull's 'Give Me Everything' ft. Ne-Yo & Nayer

As for the rest of the top 10: Rihanna (No. 2), Akon (No. 5), and Eminem (No. 6) hold their positions, while Shakira (4-3), Katy Perry (9-7), Michael Jackson (11-9), and Don Omar (7-10) mix it up.