こちらは参考になるでしょうか。
●Yahoo! Answers
http://en.wikipedia.org/wiki/Yahoo!_Answers
●Wiki Answers
http://en.wikipedia.org/wiki/Wiki_Answers
●Answerbag
http://en.wikipedia.org/wiki/Answerbag
●Ask MetaFilter
http://en.wikipedia.org/wiki/MetaFilter
●Askville
http://askville.amazon.com/Index.do
http://en.wikipedia.org/wiki/Askville
●Blurtit
http://en.wikipedia.org/wiki/Blurtit
●FunAdvice
http://en.wikipedia.org/wiki/FunAdvice.com
●GirlsAskGuys
http://en.wikipedia.org/wiki/GirlsAskGuys
●Google Answers ←※Google Answers is no longer accepting questions.
http://answers.google.com/answers/
http://en.wikipedia.org/wiki/Google_Answers
●Hunch (website)
http://en.wikipedia.org/wiki/Hunch_(website)
●LinkedIn Answers
http://www.linkedin.com/answers
http://en.wikipedia.org/wiki/LinkedIn_Answers
※参考URL
●米国Q&Aサイト人気No.1は「Yahoo! Answers」、トップサイトに見るQ&Aサービスの歴史:MarkeZine(マーケジン)
こちらは参考になるでしょうか。
●Yahoo! Answers
http://en.wikipedia.org/wiki/Yahoo!_Answers
●Wiki Answers
http://en.wikipedia.org/wiki/Wiki_Answers
●Answerbag
http://en.wikipedia.org/wiki/Answerbag
●Ask MetaFilter
http://en.wikipedia.org/wiki/MetaFilter
●Askville
http://askville.amazon.com/Index.do
http://en.wikipedia.org/wiki/Askville
●Blurtit
http://en.wikipedia.org/wiki/Blurtit
●FunAdvice
http://en.wikipedia.org/wiki/FunAdvice.com
●GirlsAskGuys
http://en.wikipedia.org/wiki/GirlsAskGuys
●Google Answers ←※Google Answers is no longer accepting questions.
http://answers.google.com/answers/
http://en.wikipedia.org/wiki/Google_Answers
●Hunch (website)
http://en.wikipedia.org/wiki/Hunch_(website)
●LinkedIn Answers
http://www.linkedin.com/answers
http://en.wikipedia.org/wiki/LinkedIn_Answers
※参考URL
●米国Q&Aサイト人気No.1は「Yahoo! Answers」、トップサイトに見るQ&Aサービスの歴史:MarkeZine(マーケジン)
既出。ポイントはあげません。