What is the Commons tool?
From EdTech Help
Commons is a social networking style tool allowing posts with url to thumbnail expansion, and unthreaded replies, similar to Facebook posts. It may be used as an alternative to other communication tool options, such as Comments in Lessons, or Forums.
Note: Commons does not support grading or other more advanced Forums features, such as threaded discussions, group permissions, availability dates, etc.
To access this tool, select the Commons link in the Tool Menu of your site
Note: Commons is not typically one of the default tools in a site. You may need to add it to your site if you would like to use it.