Do we really need another acro web site? We all already have too many demands on our time and attention. Facebook and other social sites already provide space for conversation amongst friend and colleagues we know and trust. In general with public online forums, the people with the most expertise have the least time to spend writing online.
On the other hand, there are many perennial discussions which already occur frequently on Facebook. Would it be an improvement to be able to point to a link here to see what others have already said?