If you are an entrepreneur you should always remember about Bill Gates phrase stating that if you are not on the internet you do not exist.
The more we get into digital world more and more essential becomes your image online. Not having one is not an option as it is equal to not active one. And lack of activity is not a good characteristics in the face of potential customer.
Now blogging becomes a way of supporting contact, reminding about yourself and managing you public image.
You can find some basic principles here.