Active users are counted the same way. Lemmy has had lot of problems with bots registering thousands of accounts and never posting
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Still sounds pretty incredible that 99 percent of all users on Kbin would have posted or commented. According to the old 1-9-90 rule, around 90 percent of the users should be lurkers for most sites.
The Kbin users does, however, seem to post less. At least if you compare Kbin.social and Lemmy.world. At Kbin.social you have 0.63 posts per active member and at Lemmy.world it’s 2.40 posts per active member. So something seems wonky in the stats.
Is it really necessary to post or comment to be considered active? I would think reading a single thread would be sufficient. There's plenty of active lurkers that browse the forum that never post.