Blue Ridge High School issued the following announcement on Apr 09.
Dear BR Families, there have been media reports of inappropriate use by students in other IL districts using a popular educational technology platform, called Flipgrid, in a public setting. We, along with other IL districts, have been unable to reproduce this inappropriate use ourselves. Therefore, we are not currently blocking the tool as it does provide classroom benefits.
We do, however, ask that you reinforce with your student that they are never to join Flipgrid without a teacher given code or invitation. Thank You! #br_u_knighted
Original source can be found here.