Despite having 2.5m twitter followers Soulja Boy sold just 13,000 copies of his new album in the first week

"What do 2.5 million Twitter followers get you? If you're Soulja Boy, it gets you a barely tepid 13,000 in first-week sales of your new album and a debut at No. 90 on the Billboard 200. "The DeAndre Way" sold 2,000 digital copies and 11,000 physical in the United States, according to SoundScan, in the week following its Nov. 30 release. His last album, "iSouljaBoyTellem" (2008), sold 45,000 the first week -- 2,000 digital and 43,000 physical.
Now to be fair, Soulja Boy is very much as singles artist. "Crank Dat (Soulja Boy)" was the 14th best-selling digital song of all time with more than 4.6 million downloads. But even the first single from "The DeAndre Way" -- "Pretty Boy Swag" -- didn't stack up, with 590,000 downloads since it first went on sale in June. Track sales from the new album total 718,000."
Source:  Billboard, 17th December 2010