One or two of those in the message thread did use some offensive language towards the employer. I have no doubt that they will have some sort of disciplinary action taken against them as that is clearly a breach of contract.
My comments and most others in the thread were simply in relation to the working time directive and how we perceived that our rest break entitlements did not meet those laid down in the EWT. They were polite, non-threatening, not offensive and gave away no confidential information yet we all (not just those who used offensive language) have these fact finding meetings.
Your answer has definitely helped me relax. I may get a better nights sleep tonight but there is still this niggling feeling of concern.... but I guess that is what the employer wants.
Would they be able to take any action against us for just being in the general conversation, despite not breaking their rules in terms of being professional, not using offensive language etc? After all we cannot control what other people write on social networking sites.