Blogging Yourself Out of a Job

I am majoring in the medical field and just to go to clinicals I have to sign a confidentuality clause to protect a persons personal information. A company should have the same rights. Their company information is given to employees to help them succeed in their jobs and to benifit the company, not to post on blogs for everyone to read. If an employee does this, they should be fired. If they cannot be trusted with confidential information, then they probably can't be trusted in other parts of their jobs.