I seem to recall posting a review and being given an option to make my email address public so others could contact me. And I have seen posts with email addresses by the poster, although it's rare (most of us prefer to keep our email addresses private - why make it easier for the spammers?).

I also post hotel reviews, but the only other travel board I participate in is slowtalk, the forum of slowtravel. My business is focused in Italy and their Italy board is interesting and often very helpful.