Watch2Gether is a neat site through which you can watch YouTube videos and host text chats about them at the same time. I've written about the service in the past. Some new features have recently been added that are worth noting.
The first update of note is that you can now use more than just YouTube videos in Watch2Gether. You can now use videos from Vimeo and Dailymotion. If audio is all that you are concerned about sharing, you will be happy to know that Watch2Gether now supports using media from Soundcloud.
The second update, probably the most significant update for teachers, is the option to moderate discussions and ban participants who are not participating appropriately.
It is easy to start using Watch2gether. To get started enter a nickname for yourself (it could be your real first name) then search for a video or enter the URL of a video that you have previously bookmarked. When you have found the video you want a chat column will be present on the right side of your browser. You can invite others to chat with you by sending them the URL assigned to your chatroom.
Applications for Education
Watch2gether is a nice tool to use to have students share observations, ask questions, and answer questions while watching video clips in your classroom or as part of a flipped lesson they're completing at home.