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I'm sad they didn't show how many people use "teeheehee." I don't know when I started that habit but now I'm using it occasionally.

Footnote 2 seems to be a listing of the regexes used. It seems emoji means "some of the smilies we automatically replace with images".

I hear kids these days are using lel a lot.

Also, no muhaha or muahaha etc... but I suppose those wouldn't match too many.

> Or kekeke

That's perhaps mainly an online gaming thing? My korean friends simply type Kkk. And chinese hihi/哈, thai 555, etc - a regex nightmare to be sure