This 3 min video tutorial shows how to use the digital tool Padlet. I found it on the ETMOOC diigo site which I am subscribed to. Michelle Poulter posted about Wallwisher (now known as Padlet) on her blog also.
Just read David's bookmark for Mural.ly. Blog post is here http://ilearntechnology.com/?p=4972
The author says Murally reminds him of Padlet. Google docs for visual learners. Interesting.