Coming from the programmer’s point of view, my view about this is like this:
Jojo Siao
1

In April 2014, it was announced that Quora was raising $80 million from Tiger Global at a reported $900 million valuation.[21][22][23][24]

On the heels of backing the likes of BuzzFeed and Genius, Andreessen Horowitz is putting more money into digital content, this time with a technical and B2B angle. The VC is leading a $40 million round of investment in Stack Exchange, a New York-based startup that operates the Q&A site Stack Overflow as well as a host of other programmer-focused forums, with 80 million users monthly in total.

  • 2 similar ideas. Answer questions, 2 different approaches, same execution level.

I think this is a good study on the subject, Stack Overflow is a variation of similar help forums widely available and they executed well, but it was not an innovation. They still used anonymity via user handles.

Quora requires you to use your real name and social network as a foundation to getting the answers that you need.

You can argue that Quora does not answer programming questions and they are apples and oranges, but you have to also admit a degree of similarity. This is not to debate who can answer programming questions better but the quality of the idea.

There is no right or wrong answer in what company you would like or favor. There is no question that both choices will generate wealth. What is debatable is who has the greater idea or disruption given the same level of execution.

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