Used instead of the cliche, overused, hackneyed typed-internet phrase showing laughter: Haha!
Person 1: I <3 Billy*!!!!!!
Person 2: HhH!
*Billy is the main character of the popular internet documentary-- HOW TO BE: EMO. Billy learns the how-to's of being emo and how to embrace his sensitive side, instead of caving to his father's pressures for playing football.