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National Wildlife Federation

• http://beth.typepad.com/beths_blog/2008/04/social-media-ca.html

The Nature Conservancy

• http://www.slideshare.net/jcolman/using-online-social-networks-to-build-buzz-community-support-for-your-cause

Note: over 108,000 visitors referred to nature.org from Digg during the current fiscal year.