Lady Gaga Sued Over Japan Earthquake-Relief Charity Bracelets
Lady Gaga Sued Over Japan Earthquake-Relief Charity Bracelets

Lady Gaga (2-1) takes the No. 1 slot from Justin Bieber (1-2) on the Social 50 chart this week, after the latter pop star held the spot for four weeks straight. With Gaga in non-stop promotion mode as the May 23 release of her "Born This Way" album nears, one should expect the diva to remain atop (or near the top) of the Social 50 next week.

To dethrone Bieber, it took Gaga a 10% gain in Facebook Likes (up 450,000 compared to his gain of360,000), as well as a 23% increase in overall views across monitored music outlets.

Due to a humorous, tongue-in-cheek new video, LMFAO enters the Social 50 for the first time at No. 39. "Teach Me How To Shuffle," uploaded May 4, has invoked 47,000 views (a 50% week-over-week increase). The group's best-selling single "Party Rock Anthem," of which the video below satirizes, has held No. 1 on the Official U.K. Singles chart for the past four weeks. The original video for the single -- released two months ago -- has 34.2 million views.

Video: LMFAO, "Teach Me How to Shuffle"

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.

On a career comeback, in part fueled by her stint judging "American Idol," Jennifer Lopez vaults 35-14, with a big lift in week-over-week views (180%) and (57%) plays. Her new single "I'm Into You," featuring rapper Lil Wayne (10-11), resides on Lopez's latest album "Love?," which hit stores last week (May 3) and debuted at No. 5 on the Billboard 200 this week. The music video for "Into You" has brought in 8.9 million views since being uploaded to YouTube on May 2.

Lopez also saw an increase in views and plays on MySpace (up 51% and 52%, respectively), which houses her prior single "On the Floor." The track rises to a new peak of No. 3 on the Billboard Hot 100 this week.

Beastie Boys went from making "some noise" last week, bowing for the first time on the Social 50 at No. 44, to creating an absolute ruckus as they climb 28 rungs to No. 16. The hip-hop trio amassed 1.4 million plays on Vevo (up 118%), giving its latest single "Make Some Noise" a total of 933,000 views. The new album "Hot Sauce Committee Part Two," debuts on the Billboard 200 at No. 2.

In a huge 27-10 bound, Deadmau5 cracks the top ten, helping bump Lil Wayne out of the region (11-10). The former's year-old song "Ghosts 'n' Stuff" accompanied "Dancing With the Stars" contestants Chelsea Kane and Mark Ballas on May 2, helping push his increase in social buzz this week. Deadmau5 also released a trailer on YouTube announcing his first ever headlining outdoor show at Victoria Park in London, which added 65,000 views to his weekly total of 123,000 -- a 225% gain in views. In all, Deadmau5 pulled in a 186% boost in plays on Vevo.

Video: Deadmau5' "Ghosts 'n' Stuff" on "DWTS"

Nicki Minaj also rushes into the top 10 (12-8), stealing the No. 8 rank from Katy Perry, who herself pivots 8-7. The charismatic MC released a video for her latest single "Super Bass" on May 5. It has since garnered a staggering 10.6 million plays on Vevo, giving Minaj the 109% gain in plays. "Super Bass" enters the Hot Digital Songs chart at No. 31 and rises 98-48 on the Hot 100.

As for the rest of the top 10: Eminem and Shakira each move one notch (5-4 and 4-5, respectively), while Rihanna (No. 3) and Akon (No. 6) hold steady.

Notable chart reentries include Avenged Sevenfold (No. 45) and Daft Punk (No. 50).

Enrique Iglesias suffers the chart's biggest fall. Unable to retain the social momentum gained last week by winning the artist of the year trophy at the Billboard Latin Music Awards, he drops 7-43.