This summary from the Educator's Guide to Flipgrid sums up the tool well:
'Using Flipgrid isn’t about recording videos...it’s about learning. Learning that is social, personal, can happen anywhere and anytime, about making connections, it’s deep exploration, and promotes that everyone is a teacher and everyone is a learner.'
If you are looking to build a constructivist and connectivist teaching environment, then Flipgrid could well be a useful tool for you to explore.
Flipgrid is a video discussion platform designed to encourage students to express their ideas and opinions. You can access it through Office 365 in the same way you would open any other Office 365 app.
Flipgrid is made up of Grids and Topics. Grids would be set up for module groups or other groups and then Topics are created for each subject you want students to discuss.
You would normally post a question or idea - this might or might not be in the form of a video. Students then responding by adding their own videos.