I've never once had an issue with not getting answers on Reddit or Quora.

As of right now, Reddit is up and running for me. I get answers on here to my questions. Sometimes, it just takes a little while. I just sit back and wait. And if I don't get an answer here, it's no big deal, not the end of the world.

As far as other Q and A sites, there's none that I know of. I know of this site because I saw someone posting about it on Yahoo Answers before it shut down.

So I did some searching and found a list on wikipedia. https://en.wikipedia.org/wiki/Comparison_of_Q%26A_sites