Most of the posts that I think have caused this problem seem to have come from relatively new members.
'xactly. The infestation has probably been spread by word of mouth. I don't mind (and contribute to) the occasional 'reggie' thread, but do so in the Spectators' Balcony where it belongs.
But I wouldn't want even that polluted with "Wot was the Korean 777 today ?"-type posts. There are other websites for that.