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you know where this will end up right? Anytime you offer anonymous photo sharing it will quickly turn into illegal porn distribution.

One reason for the "Hate" button; it cuts the expiration time remaining in half.

Implying that people hate porn

People will simply link to the picture and tell their viewers to like it to counter act that effect.

You should have a 'report' button or better yet, ask people if the picture is NSFW and segregate.