The following is a list of some of these rules and policies I deem very important:
1- The company should use professional language at all times.
2- The company should provide clear rules to its employees on what can and cannot be posted on its blogs.
3- The blog posts should be respectful. Blogs are open to the public, and should therefore show that the company is respectful towards its customers and employees.
4- The blog posts should represent the mission statement of the company. It should be clear to every reader what the blog is about and what is the company trying to convey to the reader.
5- The blog posts should be based on facts. They have to be verified before they can be posted on its blog.
6- The company needs to give itself the right to delete any post on its blog deemed contrary to company's policies.
7- The company needs to also make sure to differentiate between its posts and its readers posts.
8- The company should review the reader's comments before it can allow to post them on its blog.
These are just a few of the rules that a company should think about before implementing a blog site. This list is not complete and I am sure depending on the company, the rules are going to be different.