Voice thread

I could go both ways on the idea of using a voice thread. I mean it is neat and interactive, but could cause the students to talk more than watch the actual video. I can see were it would great for students to be able to talk to each other to help better understand what is going on. PLus they would be able to use this since they already use myspace and facebook to talk to each other. I just feel that it would get abused and they would be talking to wach other about things other then the video. This could harm the other students in the clkass trying to listen to it.