 In 2010, Eminem again began collaborating with Royce da 5 '9 "on their first EP as Bad Meets Evil; the duo formed in 1999. The EP, Hell: The Sequel, was released on June 14, 2011. Eminem was featured on Royce da 5' 9"'s "Writer's Block", released on April 8, 2011. On May 3 they released the lead single "Fast Lane" from their upcoming EP, and a music video was filmed. In March 2011, within days of each other, The Eminem Show and The Marshall Mathers LP were certified diamond by the RIAA; Eminem is the only rapper with two diamond-certified albums. With more than 60 million "likes" he was the most-followed person on Facebook, outscoring Lady Gaga, Justin Bieber, Rihanna and Michael Jackson. Eminem was the first artist in five years with two number-one albums (Recovery and Hell: The Sequel) in a 12-month period. Early in 2011 he leaked "2.0 Boys", on which Yelawolf and Slaughterhouse collaborated when they signed with Shady Records in January, and performed it in April. Bad Meets Evil released their next single, "Lighters", on July 6 and its music video in late August. On August 6, Eminem performed several songs from throughout his career at Lollapalooza with the artists who had been featured on each song.
