There are so many points in the OP I could pick up on, like the fact that this form isn't for free speech, the fact the thread hasn't even been deleted and the fact that the moderator who locked the thread posted in the thread with a reason for locking it.
Since some of this has already been covered, I figure I'll just make a comment on this idea of free speech on forums, since it comes up on every messageboard sooner or later. This forum isn't for free speech - it's a privately 'owned' message board and whoever owns it can do whatever they want.
If whoever owns this board decided we could only post about chocolate ice-cream you'd have no recourse. As citizens in Australia we don't even have a right to free speech (and even if you want to argue that we have an implied right to free speech you'll acknowledge it's limited).
Yes, a pretty ironic set of circumstances. However, I think it's coherent to argue for 'free speech' as a citizen while arguing against the publication of certain types of speech on a Twitter account when you're representing an organisation and have your tweets published on that organisation's website.
(Since people don't tend to read posts too closely at times, I feel the need to point out that in this post I am neither advocating or objecting to the aforementioned view).