Flipgrid is a new site/community/app that reminds me of a more "adult" version of Voicethread. This is a nice site/community and iPad app that allows educators to record a video (asking a question) called a grid and then have students respond via their own video. Educators can then view through their admin page which videos have been viewed, questions answered, etc.
Best of all Flipgrid has an educational portal where students don't need an email address or account to access teacher's grids, as well as many privacy options for educators to control. Finally, a Flipgrid can be embedded into a site and easily integrated into any LMS (Learning Management System).
I highly recommend checking out Flipgrid by clicking here.
For the free iPad app click here.