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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.

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دنیای علم و تکنولوژی - اخبار و مقالات مربوط به دنیای علم و تکنولوژی

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 ...

When you find something you want to view later, put it in Pocket.

Give someone you hate a free URL with their name in it (anonymously send as ecard)! When they visit the link, they will be hammered with random insults (they may cry)! Email your victims with our anonymous emailer! It

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

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Yahoo! Groups offers free mailing lists, photo & file sharing, group calendars and more. Discuss hot topics, share interests, join online communities.

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've been working on.