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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 ...

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

The mission of the National Institute on Drug Abuse (NIDA) is to lead the Nation bringing the power of science to bear on drug abuse and addiction.

Vimeo is a respectful community of creative people who are passionate about sharing the videos they make. We provide the best tools and highest quality video in the universe.

Providing researchers with access to millions of scientific documents from journals, books, series, protocols and reference works.

Vocabulary.com helps you learn new words, play games that improve your vocabulary, and explore language.

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Academia.edu helps academics follow the latest research.

Flickr is almost certainly the best online photo management and sharing application in the world. Show off your favorite photos and videos to the world, securely and privately show content to your friends and family, or blog the photos and videos you...