Wallwisher is paper for the web. It is a wall (blank page) that you put anything you want from anywhere. This page can be used to make noticeboards, to share ideas, brainstorm, etc.
Teaching idea: pose a question and children would post their feedback.
Click on this page and the wall you see will give you suggestions on how to use this wall............ Lot’s of possibilities. http://wallwisher.com/
An example of a wall: