5,561,000 million, to be exact. That gives the Black Eyed Peas #1 and #4 (“Boom Boom Pow,” 5,298,000) on the all time digital sales list — which has been around since July of 2003 — reports Billboard. For context, there were roughly 252,908,000 internet users in America, total, circa 2009. Though it’s probably safe to assume that Europeans did a lot of the work in this case.