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Google Groups
Google Groups is all about helping users connect with people, access information, and communicate effectively over email and on the web
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Curriki - WebHome
Curriki, the online education community, is building the first website to offer free, open-source instructional materials for K-12.
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Elgg.org
Elgg, started in 2004, is an open source social engine which powers all kinds of social environments - from education and business to martial arts and rugby.
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Twitter: What are you doing?
Twitter is a free social messaging utility for staying connected in real-time.
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