If you are asking your student's to populate a Glossary with content, it is good practice to create a few sample entries, to give your students a clear understanding of how the Glossary functions, and what your expectations are. You can also demonstrate the full breadth of the functionality which is available to them, by including: embedded video and social media content; additional content such as PDF and PowerPoint files; and illustrating your entry with Creative Commons media.
You and/or your students are able to rate entries in a glossary.