If asked to explain in single sentence, I would say it is twitter version of Quora/AskReddit/YahooAnswers.
The idea behind the app is this - every question in this world can be asked in a simple short way, even complex questions can be asked in multiple short questions. The same goes with answers - every answer can be broken into multiple short answers.
https://play.google.com/store/apps/details?id=com.plusask.android
