A professional blog can do many things for a business, but one major advantage is networking. A business can use a blog to advertise. By doing this a business can bring in new customers and keep old ones. It can post anything about its products and the business. I believe networking is the most important part of a company; without this a corporation can't grow.
In addition, a business can use a professional blog to associate the company with a reputable professional. With a professional blog, a business will hire someone who writes the blog making it a reliable source. This ensures, when reading a company's blog, you know that you can trust what the blog has posted.
Finally, a professional blog can be used as a source of invaluable information to check out competition, accelerate the growth of a business, and can also help avoid costly mistakes.