You know, this is probably a big part of it. On a touchscreen 'haha' and 'hehe' are way easier.
24 karma · joined September 19, 2013
http://www.wired.com/gamelife/2007/12/phantom-keyboar/
Aaaand looks like the keyboard actually made it to market, there's even one on ebay. I had no idea.
I'd much rather go that way than write code that reads less like a human wrote it.