2. LinkedIn is a business-related social networking site . Founded in December 2002 and launched in May 2003, it is mainly used for professional networking . As of 3 November 2011, LinkedIn reports more than 135 million registered users in more than 200 countries and territories. The site is available in English, French, German, Italian, Portuguese, Spanish, Romanian, Russian, Turkish and Japanese.
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5. LinkedIn Groups allow you to: Quickly discover the most popular discussions in your professional groups. Have an active part in determining the top discussions by liking and commenting. Easily browse previews of the last three comments in a discussion. Find interesting discussions by seeing who liked a discussion and how many people commented. Groups
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10. Mobiles Take LinkedIn with you! Access your connections, profiles, and network updates wherever you go with LinkedIn’s mobile applications. With these free apps for BlackBerry, iPhone and Palm Pre, you can take your LinkedIn network with you and connect with new contacts on the go.