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Buzznet and Kazaa are what people usually think of as just being music friendly. Although these sites are based of music sharing, they can do a lot more. Just like youtube having more possibilities than just looking at videos. A lot of sites have the capability to offer music to users in some way. These are just some sites that have becomes very popular in diong that, and in some ways offer interesting accessories to allowing social networking along with the music itself.
Example: Vimeo allows special sharing capabilities that make it easy to share with family, firends, and co-workers the videos and music you want.
Refer to Articles section for more ideas and viewpoints on how other people have used these sites.
Buzznet
Youtube
Kazaa
Vimeo
Activities
Creating an account on Buzznet allows a lot more than just posting your home made videos. You can upload photos, share music, videos, and find friends. All of this is one thing, but try creating an account and using it in your company. Uploading company tutorials. Post articles about upcoming events. All of these ideas are just the beginning to using a site like Buzznet to become a large social networking/learning tool.
Articles
Check out these articles to give you an idea on how these resources can be used for a lot more than they may seem. You might find out ways to use some of these social networking sites in ways that can really help you.