Should I stop posting from work?

[Not Afraid]

It sounds like you have a make a personal choice based on risk. If you have a manager who is under pressure or is they type of manager who puts pressure on the employees, I would not risk it. It could be grounds for diciplinary action. But, many companies reiterate their policies on occasions so if they "need to enforce the policy" they have done their side of the deal by notifying the employee.