Both songs are the two most global and best selling singles by each respective artist in the 2000s decade (Poker Face 14 million; Hung Up 8.5 million). Hung Up went #1 in a record number of countries and also occurred very late in Madonna's career. But which song is bigger?
It's sold less, but it was released before singles sales and digital outlets really blew up and started dominating and it was also released after Madonna's biggest flop and after a considerable decline in popularity. It also had to deal with a US radio snub because of American Life.
Hung Up, aka the one that holds a Guinness World Record for being #1 in the most countries at one time But waiting for "receipts" with sales to prove people wrong even though those don't really matter and are irrelevant in this case /
It's sold less, but it was released before singles sales and digital outlets really blew up and started dominating and it was also released after Madonna's biggest flop and after a considerable decline in popularity. It also had to deal with a US radio snub because of American Life.