Introducing Open Rev!
Physics graduate students Erik Bauch and Georg Kucsko have developed an online tool for collaborative annotation of scientific publications, Open Rev., which enables scientists discuss science openly, independently of publishers and impact factors, and on a platform that is easily accessible and free for everyone in the world.
The principle is both simple and powerful: a scientist uploads a paper, highlights specific sections and generates a related question. The paper, highlighted passage and question are then available to the community to respond to. Similar to other popular platforms like Quora and Stackoverflow, questions and answers can be voted up, allowing good content to rise to the top.