Sometimes product development is very simple

Sometimes it is possible to take an existing product, tweak it very slightly, and achieve very different results. For example, what exactly is the difference between a forum (or to use a more antiquated term, "bulletin board") and a site like yahoo answers or quora? Basically all you have to do is change the name of "thread" to "question" and "Reply" to "Answer".

The point is, pivoting a product can require only a minor functionality change, but can result in access to very different markets and very different success rates.