There is so much bullshit on the internet that you'd really need something specific and explicit to go to the cops. Pictures and direct threats would be ideal. Not to mention you need to know an approximate location in which to call the cops - there are no interweb police, although a threat communicated interstate might involve the FBI, I don't know how much interest they'd show. Best to grab some screenshots on a flash disk and go down to the local field office. And have a moderator trace his/her IP. You need compelling evidence that a crime is about to be or has been committed. Not just some kid posting "ZOMG im gunna kill u!!11"
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