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So this is perhaps more about research generally than research on covid 19, but the implications are actually quite interesting:
https://twitter.com/TomerUllman/status/1252948512272154624
The reply to the first comment in particular:
https://twitter.com/emilio__ferrara/status/1253436545467478017
"The entire social science research on #covid19 will be based on the dozens or hundreds of survey responses given by the same few Turkers over and over."
Think about what this means for metanalyses. (or don't. I'm not your mum).