Excellent demonstration of the basic definition of social networking. The downside to the learning tool is that it is slightly outdated. Crafted in 2007 it references MySpace which is not really a name brand social network anymore. Having said that it doesn't discount the accurate definition of social networking. It will definitely appeal to those who aren't techy-techs as there isn't a lot of jargon/lingo that would overwhelm. Given the speed at which social networking tools are growing it might be worthwhile to revise to include the different varieties of tools.
I accessed the video from a Firefox browser on a Mac running OS 10.8.2 with no problem. The video streamed via You Tube with no problem. I could see where there might be issue with schools (primarily K-12) who filter access to the site. You may not have as many viewers in that area as a result.