Flipgrid
*NOTE: Recording time has increased to 10 minutes. Flipgrid is a free video discussion platform from Microsoft that helps educators see and hear from every student in class and foster a fun and supportive social learning environment. In Flipgrid, educators post discussion prompts and students respond with short videos, whether they are learning in class or at home.
If any of you are on Twitter, Flipgrid has more information. https://twitter.com/flipgrid/status/1235700014682341377?s=21