Padlet (previously known as Wallwisher) gives you a blank wall, and you can basically put anything you want on it, anywhere. Simple, yet powerful. It  empowers people to express their thoughts on a common topic easily. It works like an online sheet of paper where people can put any content (e.g. images, videos, documents, text) anywhere on the page, together with anyone, from any device. This video and article provides you with some tips on how to use Padlet for learning and teaching

Via Anne Whaits, Mark E. Deschaine, PhD