Social media updates and work

Read this first.

So, people get fired if they state something negative about their work environment. Workplaces are also penning in clauses in the contract to avoid defamation by their employees. But doesn’t this go both ways?

What if an employee wants to say something good about the employer? If that can be allowed, then the opposite should also be allowed.

In my own case, I use humor and sarcasm in every aspect of my social life. Once, I was warned to not repeat some clever sarcastic wordplay because my ‘then’ manager thought that it was inappropriate.

So, I’m confused.