"Back In Black" was certified 25x Platinum in the US by the RIAA on December 6th. The album was last certified at 22x Platinum (22 Millions units sold) exactly 12 years ago in December 2007. Since February 2016, downloads & streaming are accounted for in the certification process in addition to actual physical sales, with 1,500 song streams equivalent to 1 album sale. "Back In Black" is now the 4th biggest album in US history, behind The Eagles Greatest Hits (at 38x Platinum), Michael Jackson's Thriller (33x), and The Eagles "Hotel California (26x), surpassing The Beatles White Album (at 24x), Led Zeppelin IV and Pink Floyd's The Wall (both at 23x).
I'm just a Bad Boy Boogie