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Scribd is a social publishing site, where tens of millions of people share original writings and documents. Scribd

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

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 friends, upload an unlimited number of photos, post links and videos, and learn more about the people ...

A website focused on America and Americans, their news, their arts, their opinions, their business, their policies and policy, with quotes and notes, views and reviews, from across the United States, around the world, and outer space.

LinkedIn strengthens and extends your existing network of trusted contacts. LinkedIn is a networking tool that helps you discover inside connections to recommended job candidates, industry experts and business partners.

PLoS ONE: an inclusive, peer-reviewed, open-access resource from the PUBLIC LIBRARY OF SCIENCE. Reports of well-performed scientific studies from all disciplines freely available to the whole world.

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