Ideas for a Online Contest

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Hello All, Consider there is a forum which focuses mainly on giving business advices. Online Contests are one of the way through which this forum is being promoted. I need some fresh ideas for this online contest which will induce and motivate the members to actively participate. Some of the topics of our earlier contests are: 1. Logo Contest 2. Best or Useful thread contest - conducted every week 3. Referral contest - for every month What other ideas can you think of?