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 fr...

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

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

See what your friends are reading. Keep track of what you

Google+ aims to make sharing on the web more like sharing in real life. Check out Circles, Messenger and Hangouts, just a few of the things we&#39...

Academia.edu helps academics follow the latest research.

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

Internet Archive is a non-profit digital library offering free universal access to books, movies & music, as well as 150 billion archived web page...

Flickr is almost certainly the best online photo management and sharing application in the world. Show off your favorite photos and videos to the worl...

Lulu.com lets you make, self-publish, print and sell print-on-demand books, e-books, photo books and calendars with free book publishing.

The National Library of Medicine (NLM), on the campus of NIH in Bethesda, Maryland, is the world