S.NO Question and Answer website list
16 http://ask.metafilter.com/
17 http://askville.amazon.com/
18 http://en.bab.la/forum/
19 http://en.wikipedia.org/wiki/Wikipedia:RD
20 http://goaskalice.columbia.edu/browse-our-qa-library
21 http://homeschoolhelpdesk.com/
22 http://iask.sina.com.cn/
23 http://kin.naver.com/
24 http://lostquery.com/
25 http://mathoverflow.net/
26 http://otvet.mail.ru/
27 http://otvety.google.ru/
28 http://qna.rediff.com/
29 http://respuestas.trabber.com/
30 http://sintei.com/
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