You love your job. You love your job so much that you like to blog about it when you get home. But, what if your employer does not like your comments? A recent federal appeals court decision applies some limits to what you can say in your post. See Richerson v. Beckon.
The only reason you have some rights is if you are a government employee. As a public employee, you are entitled to some 1st Amendment rights when discussing issues that affect the public.
The 9th Circuit Court of Appeals drew the line at several vituperative and highly person comments. That makes some sense, since 1st Amendment speech must be concerned with public, not very personal views. But, remember, you only get to make such comments in the first place if you are a public employee commenting on matters of public concern. Private sector employees have no comparable free speech rights.