Current breakdown at the time of this post sorted by the number of monthly active users:
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If you only include active last month, we are are at about 70k active users. Active meaning posted or commented.
If you assume 90% are lurking and not active, then that value can be as high as 700k. But likely 2M is off target.
90-9-1 rule says that you may in fact be correct.
90% are probably lurkers. But there is a good argument to be made that a lot of the recent growth is from the 9% of contributors on Reddit, and some of the 1% also.
Currently I suspect that much less than 90% here are lurkers, but that should balance out over time just due to how social communities work.
You’re likely correct on all of your assumptions, in my opinion :)