We Can't Stop has been in the Top 10 for over two months, and spent the last 10 weeks in the Top 3 on the Bilboard Hot 100. Sold over 2 million copies and still selling 100k+ a week. While Wrecking Ball, which was released on a Sunday, unannounced, sold 90k in one day and is still Top 10 with no promo, no video, no airplay, and no clear indication if its the second single or just a promo single. She's doing fine thanks.
