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I wonder what % of users submit posts and browse new submissions on here and on reddit.

90-9-1 principal is considered the truth, though I've not seen any rigorous studies to back that up.

At the very least I'm confident it's a power-law distribution. 90-9-1 seems like a reasonable first-order estimate (but I've also seen no data)

I think it’s single digit percentages that have an account.