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