Blogs are not good for every site, and they are not good for every person, but writing one opens you up to a wide array of links and that would otherwise likely remain unavailable. Blogging also helps you visualize what ideas are spreading, why they are spreading, who is important to know to help spread ideas, and how they were marketed to spread.
If you know what ideas are spreading, why they are spreading, and who is spreading them then it gets much easier to create ideas that spread and ensure they spread. Link.
Find this article at: http://www.labnol.org/internet/blogging/why-should-you-add-a-blog-to-your-website/1235/
