Facebook is a social utility that connects people with friends and others who work, study and live around them. People use Facebook to keep up with fr...

LinkedIn strengthens and extends your existing network of trusted contacts. LinkedIn is a networking tool that helps you discover inside connections t...

YouTube is a place to discover, watch, upload and share videos.

foursquare

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Twitter is without a doubt the best way to share and discover what is happening right now.

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Diigo is a powerful research tool and a knowledge-sharing community