Quora is a question & answer site with a world-wide user base, although a significant majority is from the US. Lots of trolls, but also a lot of legitimate questions and responses covering pretty much any topic you can think of, from adultery to zoology. I'm a regular contributor, responding primarily to questions about world affairs, economics, military and civil rights issues. I'm a respondent only, so far. Every time I've thought of a question I wanted to ask a search showed it had already been posted and answered. I post under my own name.