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/