MENTAL MODEL · M3776

Eternal September

BusinessHigh supportManagement

Included

Version 1.0.0 · Updated 2026-07-30

CORE DEFINITION

Refers to September 1993, when AOL began offering Usenet access to the general public, causing a large influx of newcomers unfamiliar with netiquette, which completely destroyed the high-quality discussion atmosphere of the original community.

SCAFFOLDING EFFECT

psychology

Reduce cognitive load

Community dilution law. Any elite community, once opened to the masses (Scale up), will inevitably have its original cultural density diluted. Managers must design 'firewalls' or 'newbie villages' mechanisms to counter this entropy increase.

anchor

Anchor fast decisions

Elite communities maintain quality through high cultural density and shared etiquette; once opened without barriers to a flood of newcomers (Scale up), newcomers dilute the existing norms, and the old rhythm of 'after September, newcomers become old-timers' can never be restored. Community quality increases in entropy with scale.

MINIMUM ACTION

In progress 0/1

Practice this model in one real situation:

When designing communities/products, presuppose 'scale equals dilution': set up newbie guidance (newbie village), entry barriers, or cultural firewalls to decouple density from openness. Monitor discussion quality metrics and intervene early in dilution rather than waiting for collapse.

Check to track your progress (stored locally)

Learning progress0%

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Source support: Explicit

link
en.wikipedia.orghttps://en.wikipedia.org/wiki/Eternal_SeptemberZH · Explicit
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