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I heard it’s something like 90% of people lurk, 10% of people comment, 1% of people post. So you need a pretty substantial population just to have enough posts and comments for the lurkers to still hang around.
It’s also why it was particularly dumb of Reddit to piss off their 1% and 10%.
MMR was the boogeyman jab that started the whole modern antivax movement. I wouldn’t say it’s rare for antivax people to be opposed to getting the measles vaccination.