Just pick one
Pornhub comment section
I do like quora when there is a question that i wouldn't usually find anywhere else, yahoo answers is useless, and reddit is interesting
None, personally. If a link to Reddit or Quora comes up on Google for a certain topic that I am interesed in, then I will click on it to read the comments. Nothing more since I do not have an account on those websites. I haven't logged on to Yahoo Answers since 2013? I used to be active on that throughout 2008-2013.
Yahoo is for retarded attention whores
Reddit is for memes
Quora is for random subjects that people talk about with way too much detail