Empiriceme · Precept · Heuristic / Razor

90-9-1 Rule

Also called The 1% rule; participation inequality

Online participation is often highly skewed, with a small minority producing most content; 90/9/1 is a rule of thumb rather than a fixed ratio.

Wikipedia is the standard illustration: a few thousand editors write most of a site read by billions. The proportions vary considerably between communities, and the durable point is that engagement metrics from a comment section describe the contributors rather than the readership.

In practice

  • A company launches an internal forum and declares it a failure after a month because only eleven people have posted; the 900 who read it daily are invisible to the metric.
  • A product team reads its app store reviews as customer sentiment, when the reviewers are the fraction angry or delighted enough to write, and the silent majority is neither.
Possible explanations
One explanation is cost: reading, replying and creating differ by an order of magnitude in effort. Another is exposure, since visible contribution invites criticism that lurking avoids.
In its favour
Heavy skew is found in every online community that has been measured, and the rule is a useful corrective to reading a comment section as public opinion.
Against it
The proportions vary widely between platforms and tasks, and the figures are often quoted as though 90, 9 and 1 had been measured for the community in question when they have not.
Standing
A rule of thumb rather than a fixed ratio; the proportions vary considerably between communities.
Further reading
Wikipedia
Subject
Communication & Media
Essay
Rules for speaking, writing and disagreeing

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