All time since Septermber 1993
September was the time when all the new (American) College students got their first InterNet account and plunged right into it without looking up rules of Netiqutte etc. They became a plague in UseNet, but were usually assimilated within a few months.
In September 1993, AOL users gained the ability to post to UseNet.
'Nuff said....
One page links to SeptemberThatNeverEnded: