Jennifer Lopez  leaps into the top 30 of Billboard's Social 50  chart, climbing 38-29, thanks to buzz generated by her TV commercial with Fiat, a new music video, and a red-hot performance at the iHeartRadio Music Festival.
During ESPN's "Monday Night Football" telecast on Sept. 12, a 30-second ad ran, which featured scenes from her video for the single "Papi,"  which then debuted on YouTube on Sept. 19.
The video has since accumulated 9.9 million Vevo plays and boasted her total week-to-week plays to 21 million. In total, her YouTube profile views also jumped from 14,000 to 16,000 views week-to-week. Across all monitored social networks and music outlets Lopez added 139,000 new fans, up from the 130,000 fans she gained the week prior, with Facebook seeing the biggest jump.
Then, on Sept. 23, she also performed at the sold out iHeartRadio music festival in Las Vegas.
WATCH VIDEO: Jennifer Lopez Talks 'Idol' at iHeartRadio Fest 
Billboard's Social 50 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.
For the 10th week in a row, Justin Bieber sits at No. 1. Aside from just being the Biebs, the star didn't do anything too remarkable -- aside from reveal new potential collaborations for his soon-to-be-released Christmas album "Under the Mistletoe," which include the Band Perry and Usher.
He also posted on Facebook about a web campaign called "Hearts Across The Web," asking fans to create a digital heart-chain, in an effort to help him raise awareness for Pencils of Promise, a non-profit that builds schools throughout the world. If 500,000 fans join in, Give Back Brands, who he has partnered with to make his fragrance "Someday," will help to build more than 50 schools globally.
During the tracking week, Bieber added 343,000 new fans -- across all monitored social networks -- that helped in playing his songs and watching his music videos 14.5 million times.
Katy Perry had a nice 8-5 leap this week, which can be partially attributed to her appearance on the cover of In Style magazine and a promotion with Schick Quattro for Women.
In both instances, fans were directed to the brands own Facebook page, where if liked, fans could gain behind the scenes access to her cover shoot and tour. With Schick, fans are asked to take and upload Perry look-a-like photos for a chance to win a meet and greet her at a Los Vegas show.
When taken together, these events helped Perry add 404,000 fans across all monitored social networks, with Facebook seeing the largest gain at 162,000 fans. Her plays actually fell down to 11.9 million this week, having ranked in 12.4 plays last week. Meanwhile, her YouTube profile views climbed from 82,000 to 101,000 week-to-week, though no new videos are featured in it.
Brazilian country stars Joao Bosco & Vinicius debut on the tally at No. 39, with success of their video for their latest single "Tarde Demais." Since being uploaded to YouTube on Sept. 15, it has raked in 730,000 views. On Twitter, the act pulled in 10,800 new followers, bringing their total up to 144,000 follows.
Back in the top 10, David Guetta (No. 10) and Taylor Swift (No. 9) hold their respective places. Meanwhile, Lady Gaga (3-2) and Pitbull (4-11) rise, while Rihanna (3-2) and Adele ( 5-6) fall.
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