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The Fall of Stack Overflow
(observablehq.com)
A nice place to discuss rumors, happenings, innovations, and challenges in the technology sphere. We also welcome discussions on the intersections of technology and society. If it’s technological news or discussion of technology, it probably belongs here.
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https://en.m.wikipedia.org/wiki/Fediverse
Based on that, there is no "q&a" type of Fediverse software (a clear answer and a clear "voted best" answer).
Stack overflow had a huge number of "mod tools" to help curate the content (gold nuggets) given. They did not do the step of aggregating content (gold ingots) like Wikipedia has. The marking as duplicate could and should be tempered by "due diligence" or "age of the last time this was asked", but how it is implemented is up to them.