Social networking is a method to link communities of people together in some fashion, usually by software. The software, though varies from network to network usually gives users the ability to share and upload photos, videos and bookmarks, blog, message friends, link with or make new friends.
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A wiki is an easy to use and versatile tool that allows you to share information and collaborate among friends and family, coworkers, members of a club, researchers, teachers and students, and just about any group.
