Do you use newsgroups a lot. I have followed some for years.
People can get to it through their ISP and find a topic they are interested in.
People post messages through their email program. Other users can read and even reply to those messages. Yes, I think there are some out there dealing with art works. I did look at one time. My friend sells them and I keep trying to get them to participate in some news groups to promote their Terry Redlin prints.