I agree with companies, who use blogs to communicate with current and potential customers, should be able to filter what is posted to their blog. Employees who publicly criticize their employers are just asking for some form of disciplinary action. Not only does public criticism hurt the well-being of the company but it also hurts the public image of the employee. Customers will not want to purchase products or services from someone who doesn't like or agree with their employer for fear of a bad customer service experience. If you feel the need to criticize your employer or give suggestions of how to make the experience better it should be done in private with your boss, that will most likely lead to the best result.