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Very interesting concept, I think it will be popular if it gets noticed with your target group.

Have you thought about how to prevent people gaming the system? What if someone uploads a blank image with no photo? Do you know if there is any way to automatically detect if an actual face is uploaded through some image analysis?

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Creating an face recognition system would be next step, first I want to see if there is a demand for this kind of a website. The way it is done now is, that both parties of the exchange have the access to (blurred) thumbnail sized pictures of the other party. So they can judge for themselves, if the picture is one of a person or not.

You could take a look at face.com for a face recognition API. Have only used it for some demo apps and it worked alright.

Blurred thumbnail is a great solution. Best of luck to you.

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