I've come up with some before, doesn't mean I invented them.
Just like him and his IDK's and IDC's He came up with em, doesnt mean he invented them. Two people can have the same idea.
Like my ^^; and >.> and and ._. and ;_; and XD and XP and õ¿ô, I came up with those on my own and I'm sure other people use them. Matter of fact only ones I know of that people havent used at the wtf face, the ;_:, and the ._.
I've used it before in my posts... I have only seen one person do that and that was after I had done it. Maybe someone else made it up, but I have only seen it used once by anyone besides me. So I figured I did make it up.