What IQ is too dumb for making useful contributions to discussions (public discourse) about important matters?
17
Never closes
Below 140
Below 130
Below 120
Below 110
Below 100
Below 90
Below 80
Below 70
Below 60
No such threshold
Or in other words, what IQ is the likely threshold, below which any forum posts, opinion pieces, blog posts, YouTube videos, hot takes, etc... made by a person with such an IQ score, are likely to be useless, meaningless, redundant, misinformed, or just plain wrong.
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If we assume IQ does accurately describe what it is intended to, arguably the opinions of any given IQ are more likely to be useful than those of any lower IQ, thus any >100 IQ opinions can be expected on average to be useful to >50% of the population, which seems like a reasonable threshold for general usefulness absent any more specific context.