Like all things it depends, the lower the work required by the user naturally the more people who will participate.
Winner out of the hat is one way, another way is to use "like" button on peoples replies, user with most likes wins. So for example, put up a picture and ask for a funny caption etc.
Other alternative is to use something like WildFireApp, they have a range of software (free to paid) available for running facebook comps. I've used their white label product a couple of times and its worked well.
Cheers
Fintan
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