Probably Facebook. Or Google "upside-down letters".
I can do upside-down!
umop-apisdn

Can't figure out how you did the "i", though. Half pipe? Alt+? ☺☻♥♦♣♠•◘○◙♂♀♪♫☼►◄↕‼¶§▬↨↑↑→←∟↔▲▼ !"#$%...