This is an example of running contest that has been created during the node.js conference in Brescia (Italy) http://www.andthewinner.is/nodejsconfit

These are examples of closed contests http://www.andthewinner.is/nodejsconfithack http://www.andthewinner.is/musicidol

The last one was amazing, we ran it by monitoring only mentions (as there was no official hashtag), and in 2 hours of execution we managed to get almost 31k votes :P It was pretty insane to follow it eheh