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Now, now. Let's not go vigilante. There's a site dedicated to that stuff if the OP is interested. It's called Reddit.

Edit: By the downvotes, I see that apparently HN is not above internet mob justice. My mistake, carry on.

I can tell you first hand the police don't have the manpower or knowhow to track people on the internet. They're good but they need help.

It's only vigilante justice if someone illegally punishes the criminal. Helping the police locate a suspect is called "being a good citizen".