Places like HotCopper are monitored because they only talk about 'financial products' under the Corps Act like shares, options etc. Properties, on the other hand, are not 'financial products' and hence do not fall under this scope.
The critical part of any 'financial advice' is the payment of the advice. If there is payment, then there is a presumption of reliance on that advice, rather than it just being the 'opinion' of whoever made the comment.