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they'll just sit there tapping the first picture until they reach their target. You'll get lots of votes, they'll just be useless.

Some people would do this, but as long as you randomize the order of the pictures their data won't alter the winner since each image would get an even number of bad votes.

You can also detect when people are doing this and start throwing out their votes, or just don't even prompt them to vote and show them ads instead. I'm pretty sure this would be a minority, since most people would understand that they want to get real results for their own photos, so they need to give real votes to other photos.

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