When you are really happy or excited about something or someone, then the 'Triple Smile Style :)))' is used to convey this feeling via text, IM, email, Facebook, etc...
Her: We'll have to hang out again soon. I'm having johnny withdrawals! :)
Him: I miss you too Boo =)
Her: I should put that up on Urban Dic... "triple smile style :)))" I like it!
Him: Fo sho!