What if you want a student to post material and have the rest of the class view and comment? The Wiki module might be overkill, as is the Workshop module. Maybe the Glossary module is light enough.
Here, I'm setting it up to permit comments on entries.
Glossary Module on Moodle for Sharing info b/w students
There are different styles of Glossaries... Dictionary, Encyclopedia, FAQ, etc.
This is what the student sees when they enter information. They can add attachments in addition to the text.
student entry into the glossary
Other students can then search through by topic name or by student name.
student view of glossary 2
student view of glossary 1
Students can comment, but so can profs. It appears that profs can also erase comments, based on the garbage can on the right of the following screenshot.
profs and students can comment.
Also, if you wish to require students submit something and to keep track of "completed activities" they try the following:
one entry for activity completion