Flipgrid allows students to post videos in response to a task that has been given. Others can comment on these responses with their own video. This could be just about anything:
Provide feedback
Have an asynchronous class discussion
Create a digital scavenger hunt as a formative assessment (or just for fun!) - A FLIPHUNT click here or here
Do a book review
Be the teacher and teach a short lesson
Use Flipgrid to record your screen or take a short video that you can share with students as a link or embed in your Google site - (see below)
See how others are using FlipGrid and simply make a copy and edit their discussion topic/activity.
Resources from Flipgrid: https://blog.flipgrid.com/gettingstarted