Well, it's official: Rihanna's album went back to "#1" this week with 17k sales, or less than 40% of the #1 Album Seller. (Previous low for a BB200 #1: 30k for Disney's Descendants soundtrack.) But Work has lots of streams and sales and pushed it up a bunch of positions.

Even streaming giant Harlem Shake wasn't so absurd with the Billboard special formula. The most extreme week was when it was on top though it only sold 54% of #1 seller Thrift Shop.

Which deserved multiple weeks at the top more?

Harlem Shake

Ask billboard

Streaming is the new thing, both deserved their weeks at #1, even if sales weren't its strongest points