Why did Yahoo answers fail and Quora succeed?
Why will Quora succeed in a space where Google and Yahoo answers has not?
Why doesn't Quora allow sharing answers to Google+? Why does Google not return relevant search results anymore? Why did Google Base fail? Why has Google+ failed to produce desired results? Are there more answers than questions on Quora? Why is Google so successful? Is Google about to thrive or decline in the coming years? Is Google+ a failure? Or does it still remain to be seen? What do people at Google think of Quora? Why do clicks from Quora come up as direct traffic in my Google Analytics reports? Why did Google +1 fail? What happened to Google Search? Does Google have a problem with relevancy in search results? What's the question that Google cannot answer? Why is Quora Digest filled with questions about Google, IQ, and China? Why does Quora allow so many political troll questions? Is Quora a better realization of Google's vision to organize the world's information? What's the biggest failure of Google? What do Google employees think of Quora? Is it bad to ask questions on Quora that could easily be answered via a Google search? Has one of the major search engines already attempted to buy Quora? Why does the page for search engine answers continuously update while I'm reading something on it? Why does Google  give so many search results? What happens to the winners of Google Code Jam? Does Quora have a plan for dealing with links in answers (or questions) that become invalid over time?  Would Quora be better if there were a filter to reject questions that are trivially answered via a Google search? What do you believe is the main reason for Google's (search engine) dominance? What if Google buys Quora? Are Quora blogs indexed by Google Bot? Has the boards function and follow buttons turned Quora into a blogging platform?