I am sorry if this come off as a bit offensive, but it has to be said: I am like 99.9% sure we are dealing with a troll. I have seen this tactic elsewhere, along with the related "I am from the police and the poster XX just killed himself last night, we are here to investigate the harassment leading up to his dead and would like your personal information"
The "fuckings" and the "I might sound like David but.." stuff on the previous page are IMO sure giveaways.