There is https://ask.fm also that is trying to go in this direction. Ask.fm is a kind of Quora site. They have about 200 million accounts and about 3 million users daily. Now they are having an ICO and plan to reward users for writing quality answers. Here you can have more info https://askfm.io
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nice suggestion @datatreemap! I'm testing it out now :)
Nice to know I can help ;-)