AnswerBag, SodaHead, Experience Project, probably others too…that people have mentioned…
The one I was on for six years, Ask.com, they SAID they closed down because of algorithms; wanted to try out new advances. But I have wondered if it was more the ongoing difficulties with moderation?
A couple flame warriors and trolls, even one, can certainly compromise an otherwise fine site.
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I have a special reason for thinking about Q/A sties; which is, the global potential of the Internet; what if we humankind the little folk eventually just worked out things amongst ourselves here, world peace and the environment, society problems, dysfunctional families and such, bypassing all the machinations of governments, politicians, corporations and the various military industrial complexes?
A whole new global version of 'democracy'...
So, why are do so many sites close down, why don’t they just sell out to someone else if they get tired of it all?