Facebook and Twitter are useful for connecting with family and friends. But these business social networks offer a way to connect with everyone from people working in your field to your college peers, as well as a way to learn from experts in a variety of industries.
LinkedIn
The original business networking site and still the most widely used, LinkedIn operates like Facebook for professionals in all fields. Create a profile and you can develop a sort of online resume. LinkedIn also features job classified ads and company profiles so that you can plan your next career move.
Quora
Quora is a great way to connect with experts in just about any field and to gain insights, ask questions, and participate in discussions. The site allows users to ask a question and receive answers from experts in industries ranging from fast food to web development. You can also answer questions on topics within your realm of expertise!

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