Anything you might do with a post it note you can do here: brainstorming about a new topic; sharing ideas; discussing what we did over the holidays... The children love it. It can be used like in informal discussion forum
You will need to register an account to build a wall, but as long as you choose the setting for "Everyone" to post on the wall children do not need passwords (have a go below!) The best thing is it's so easy to use. All you need to do is select a background, give it a title and brief description and if you like add a picture - done. The best thing to do with it is to embed it into a page on your website/learning platform for easy access.