Stackoverflow answers all the tech questions but they are overly pedantic to the point of ridiculous when it comes to generic tech questions.
Hackernews should have been the correct place for generic tech advise but we don't see questions of that nature here. May be as far as tech advise goes people from startups would rather write blog posts and get some credibility for their companies rather than contribute anonymously.
So how is Quora relevant or can be? On top of that they only show you one question. So that boggles my mind as to why it can become popular if its gated to begin with.