Example (the title promises more than the body of the question delivers):

<https://softwareengineering.stackexchange.com/questions/84739/what-is-the-preferable-mobile-android-iphone-game-development-tool-for-a-c-ne>

The asker has only a relatively vague idea what he is going to do, and often, when someone points him to an obvious place to look for an answer, the reply is an "but where do I start" comment from the asker. Doesn't seem to be very constructive to me. Plus there are only so many questions of that kind possible before "exact duplicates" are inevitable.