s=20 is shared from mobile website (iOS and android tested). 21 is iOS app. Don't have others to test offhand. There's a Twitter thread from a few years ago wh

s=20 is shared from mobile website (iOS and android tested). 21 is iOS app. Don't have others to test offhand. There's a Twitter thread from a few years ago where a few folk collected a bunch of them, but I can't find it anymore.