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   title       = {Stack Exchange - Free, Community-Powered Q&A}, 
   url         = {http://stackexchange.com/},
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   keywords    = {free q&a question_answering service stackexchange},
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   description = {Stack Exchange is a network of free, community-driven Q&A sites. We highlight and aggregate the best recent content from our entire network here.},
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}

@electronic{www.quora.com,
   title       = {Quora}, 
   url         = {http://www.quora.com/},
   biburl      = {https://puma.uni-kassel.de/url/18a25ddde6b2d770754a392b46c601d0/benz},
   keywords    = {platform q&a question_answering quora},
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   description = {},
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}