I’ve been planning a big contest for later this year, and thought I’d get my feet wet by running a small contest first. ShortStack allows you to make online contests which use Facebook for identifying voters. I used ShortStack to make a contest where contestants upload their best photo, then the winner is the one who gets the most votes.
I don’t like that ShortStack uses monthly billing, as I doubt I’m going to run a campaign every month. Another alternative I considered is EasyPromos.