I'm fine

Snapchat, I think. They made it so that you can see where your friends are at any given moment if that feature is activated on their app

Oh ok, thanks

I use it to watch my rich friends go places I can't afford to

If you meant the messenger on the top right (which you probably didn't bu I'll answer anyway) it's Samsung's stock messaging app, on Android 7.

It's a cupcake costume

Ooooooh.