Please can someone clarify what is and what is not allowed to be posted for discussion on these forums?

I've had a couple of posts removed, receiving no explanation or notification of any kind. If there are topics, countries or situations that should not be discussed, please can I see a list either on the forum board or sent to my registered email address.

I have supported Alibaba and I have used it to find some useful contacts over the years. I am, however, seriously considering putting all that in the past.