What can employees say or not say on social media networks? There is yet another case involving an employee who made comments on a social network criticizing management, and who was then reprimanded over it. But this time, the National Labor Relations Board is taking action by filing a civil complaint against the employer, stating that what they did was illegal and that they violated the worker's right to discuss working conditions with co-workers.

The case involves a reporter employed by Thomson Reuters who is also the head of the Newspaper Guild that represents 420 workers at the company. The Guild had been in contract talks with the company long before the old contract expired 26 months ago. She was reprimanded for posting a tweet that said "One way to make this the best place to work is to deal honestly with Guild members." This after a supervisor invited workers to send postings about how to make Reuters the best place to work.

The worker said she was told that Reuters had a policy that workers are not to say anything damaging about the company.

Last November, the labor board heard the case of an ambulance worker who was fired for criticizing her boss on Facebook. The case was settled, but still left no clear policy on what is not appropriate for employees to say. Labor law specialists, however, say that workers have the right to criticize their employer as part of a conversation aimed at improving working conditions but that workers cannot curse supervisors or make untrue statements that could damage a company's reputation.

Do you believe that Reuters, as a news agency, should be restricting the free speech of its employees? Do share your thoughts.