Padlet

Padlet is an online bulletin board that you can use to display information for any topic. Use it to collaborate in collecting ideas, brainstorming, organizing information, quirky alternative for discussion boards, solicit input, and publish student work. 

I've only used a wall Padlet, but there are other options designed for grids, discussions, walls, etc. One thing I like about Padlet, as you will see below is that is can be embedded directly into Canvas and you don't have to require students to create an account. I recommend setting the permissions for the Padlet to "moderate" so your students can add content, but can't delete. Explore below. 

This example is designed to facilitate chat and discussion: Jump in and collaborate!

This Padlet is designed as a bulletin board: Throw up some content.