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Delicious

Delicious is a social bookmarking service that allows users to tag, save, manage and share web pages from a centralized source. With emphasis on the power of the community, Delicious greatly improves how people discover, remember and share on the Internet.

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More information: http://delicious.com/about

Digg

Digg enables users to share online content by submitting what they like best. Other members can then decide if they "Digg" the content too. Once a submission has earned a critical mass of "Diggs," it becomes popular and jumps to the Digg homepage.

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More information: http://digg.com/about

Facebook

Facebook connects people with networks, each based around a company, region, or school, or any other group. People use Facebook to create profiles enabling them to keep up with friends, share links, photos, videos and messages, and join groups.

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More information: https://www.facebook.com/help/

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.

Register: https://www.linkedin.com/reg/signup
More information: http://help.linkedin.com/

Twitter

Twitter is a free social networking and micro-blogging service that enables its users to send and read each others' updates, known as tweets.

Register: http://twitter.com/signup
More information: http://support.twitter.com/