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http://www.antseyeview.com/90-9-1-principle/

The 90-9-1 Principle

If you spend any time at all talking about online communities, you’re bound to stumble across the 90-9-1 Principle. The idea is simple: In social groups, some people actively participate more than others.
http://www.freetech4teachers.com/2010/06/100-ways-to-use-voicethread-in.html

Free Technology for Teachers: 100 Ways to Use VoiceThread in Edu

100 Ways to Use VoiceThread in EDU is the title of a collaborative effort to gather educators' ideas for using VoiceThread in the classroom.