If you ever have the need to watch a video and comment in real time here is an interesting web software. This may be interesting if you wanted a class to watch and comment on a video. You might give them specific questions they need to answer or ask students to ask questions as they watch. Synchtube claims it is the only place to watch YouTube videos with friends in real-time!
SynchTube allows you to simply paste a YouTube link and create a room. You can share this room with others, and watch videos in real-time… well enough talking, just try it already!