Here are many different ways in which you can use Wall Wisher (now Padlet), and it is an excellent way to make thinking visible within and beyond the walls of the classroom. My students participated in a project with Global Virtual Classroom (GVC) where we worked with others around the world and it is a great tool for collaboration. Richard Byrne has a great tutorial on how to use it  Padlet.

19 Interesting Ways to Use Wall Wisher

Global Project:

100 Word Challenge - Creative writing for young people