One of the most powerful collaboration tools around is Padlet, which allows users to build a wall consisting of sticky notes with links to resources and materials. Anyone with the link to this wall can log in and add their own material or comments.
The wall creator can set the privacy settings to make the wall private, password protected or open to anyone to contribute. You can appoint or add moderators, making it a perfect collaborative tool for the classroom. You can also share the wall using embedded code on your web-page, Moodle or blog. A very powerful feature is that you can add to and edit your wall from inside your Moodle page. This to my mind is the key to what makes Padlet so very usable in the classroom.
The interface is clean and easy to use – you just double-click anywhere on the wall to create a new note. You then type your thoughts and can add links or uploaded files to the note, which others can then view. Simple! And all the best tools are simple.