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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Plurk is a micro-blogging site that allows users to keep a timeline of the events in their life. Users can choose what events of other users they'd like to be alerted of and create categories of those they follow.