Similar to Voicethread, however it has more features to help guide/scaffold discussions around media content. You can embed these discussions into a CMS or blog page as well.
Vialogues (which derives from "video dialogues") is an online discussion platform that permits videos to act as powerful teaching resources and the conversation starters. It provides a space for users to hold meaningful, dynamic time-stamped discussions about videos.
Excellent resource for educators and others interested in using popular culture resources of all sorts as conversation starters with students...
A considerable collection of Google Apps in education resources delivered in an Edmodo presentation. How proficient is your faculty with integrating these tools into learning?