With the flipped classroom pedagogy gaining traction, teachers are looking for ways to safely allow students to watch videos and ask questions about them.
A relative new comer, Vialogues,  might be just the thing.
You upload a video and give people something to talk about

You can make it private

You can scaffold the discussion: Add comments, surveys and open-ended questions. Guide the discussion in the way you want.

Then embed and share your vialogues easily on the learning management system or other website.
 
Are you using Vialogues with you classes? How is it going?