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CrunchBase is the free database of technology companies, people, and investors that anyone can edit.

Alexa provides information about websites including Top Sites, Internet Traffic Stats and Metrics, Related Links, Online Reviews Contact Information and Search Analytics for SEM and SEO optimization. The Alexa Toolbar is a browser add-on that shows d...

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 ...

AngelList is a platform for startups

Prezi is the zooming presentation editor

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.

Academia.edu helps academics follow the latest research.

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

HubPages is your online space to share your advice, reviews, useful tips, opinions and insights with hundreds of other authors. HubPages is completely free, and you can even earn online ad revenue!