Each bar is a year of distinct thread-starting voices - a headcount of unique root authors, not posts. A thread whose author could not be resolved still counts toward the year's thread total but adds no voice, so the count never inflates with a fabricated participant.

Participation by year
19771
19891
19901
19911
20041
20111
  • Distinct voices
Participation by year
YearVoicesThreads
197711
198911
199011
199111
200411
201111

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