Hm, actually I was in a Suicide-Workshop once (basically a Workshop to learn how to deal with suicidal People) and they said that whoever REALLY wants to kill him- / herself doesn't really announce it. They just do it. I would believe this is very true from what I have experienced. Because I think suicidal People don't want Others to stop them. Kinda the same goes for this Internet-Kid. He did do it online, but I think he knew exactly No1 is gonna stop him anyways.