If you posted a picture on Facebook or Twitter showing the world how you voted or how you intended to vote — those beautiful early ballots — you may have broken the law.
Folks at the Citizen Media Law Project put together a chart of the states whose laws prohibit taking pictures of your ballot. You can read the chart here.
BTW: "X" means that there is a law which may prohibit photographing or filming one's own marked ballot. On that note, next there's an X next to Arizona. So, while voting exhibitionism is fun, be careful out there. Arizona Secretary of State Ken Bennett might be watching, and someone (read: you) could get hurt.