Is there any way to discover similar websites..which serve the same purpose (.like fluther.com and answers.yahoo.com etc. deal with answers)

I have found a couple of dozen sites similar to fluther by typing “Question and Answer” in my search box.

You could try similico.us

Wikipedia has a list of social network sites.

http://www.convinceme.net/ is worth checking out.

I have Googled “question & answer websites” and found a poor return. The only ones I know of personally are www.cerescape.com and www.answerbag.com. I am members at both places but don’t visit nearly as often since I found Fluther.

@VS Part of the problem is that the Q & A sites come and go regularly. There are only about half a dozen successfully going most of the time.