Happy words include the omnipresent LOL and haha, as well as good, nice, sleep and wine, and food or beach related words.

CNN: The happiest and saddest states according to Twitter

I've had a few... but then again, too few to mention, haha.

CNN: STORY HIGHLIGHTS

Just wanted to throw that out there, haha.

FORBES: A Serial Online Dater Delivers His Q1 2013 Board Presentation (humor)

'Mindy Project': When does haha get hateful?

CNN: Fox orders more of 'The Mindy Project,' 'Ben & Kate'

Did Mr. Bieber dare say haha?

WSJ: Moving Targets: Queenan Imagines Twitter Feuds Involving Burr, Capone