Eternal September is a Usenet slang expression for the period beginning September 1993. The expression encapsulates the belief that an endless influx of new users since that date has continuously degraded standards of discourse and behavior on Usenet and the wider Internet. Usenet originated among universities where every year in September, a large number of new students acquired access to Usenet, and it took some time for them to acclimate themselves to the network’s standards of conduct and ‘netiquette.’ After a month or so, these new users would typically learn to comport themselves according to its conventions. September thus heralded the peak influx of disruptive newcomers to the network.
In 1993, America Online began offering Usenet access to its tens of thousands, and later millions, of users, and the massive inundation of new users was called, ‘…the September that never ended.’
The Daily Omnivore 
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