Social Networking - A Means To A Greater End

What is the purpose of social networking http://www.cybersmartwebmarketing.com/ What is the purpose of social networking as far as business blogging is concerned? Is social networking the primary traffic source for your blog? Do you submit your posts or videos to several networking and bookmarking sites all at one time? Do you ever go back to your anchor articles weeks after they are published and continue to work on them, or are they just a flash in the pan?