"We present the concept of quad-blogging, and its potential for facilitating and enhancing peer-to-peer learning in higher education, specifically in a massive open online course (MOOC) by increasing peer engagement, promoting the practice of blogging and fostering the formation of professional learning networks through social media."
They chose their rooms and paid for everything online. But their beds were provided by private individuals, rather than a hotel chain. Hosts and guests were matched up by Airbnb, a firm based in San Francisco. Since its launch in 2008 more than 4m people have used it-2.5m of them in 2012 alone. It is the most prominent example of a huge new "sharing economy", in which people rent beds, cars, boats and other assets directly from each other, co-ordinated via the internet.