Usually I add "reddit" to the search phrase and try to find threads / user-generated and hopefully more organic content this way.
reddit is good, and so is just "forum" which will turn up specialty forums that haven't been absorbed by one of the Borgs yet.
I often just add "whirlpool" which is a fairly reliable Australian forum that started covering telcos but these days will have things about cars, home maintenance, personal health, etc. Or I add "forum" and that can be enough to tilt the results.
I usually add site:reddit.com or site:news.ycombinator.com etc.
Actually google had a way to search discussion gruops, but they removed this feature as forums don't pay for their adds I suppose.