Hey there, some time ago I was doing market research for a tool I started building that would surface the best quora questions to answer on a daily/weekly basis.
Other things got in the way and I never finished it. Thinking of picking it up again now.
Would you be interested in a tool that surfaces questions in any given topic on a daily/weekly basis? It works by specifying a certain threshold of comments/likes and keywords.
answerthepublic.com is what I use to look for questions.
Personally, I just search Quora for questions when I need to answer/market some product.
If I am not wrong, Quora does send notification emails to answer any question in a specific topic, which we have answered before.