How do I stop image spam from being uploaded to my (future) site?

Posted by Pete Lacey on Stack Overflow See other posts from Stack Overflow or by Pete Lacey
Published on 2010-04-22T23:58:11Z Indexed on 2010/04/23 0:03 UTC
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spam-prevention

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image

I have in mind an idea for a generally accessible site that needs to allow images to be uploaded. But I'm stymied on how to prevent image spam: porn, ads in image form, etc.

Assumptions:

I'm assuming that the spammers are clever, even human.
I'm skeptical of the efficacy of image analysis software.
I do not have the resources to approve all uploads manually.
I am willing to spend money on the solution -- within reason.
This site will be location-aware, if that helps.

How does Flickr do it or imgur? Or do they?

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