Compuserve Forums are moderated, and the Sysop takes an active part on the proceedings, deleting scurrilous messages, and keeping a lid on blatant advertising and spamming. Many ISPs have decided not to carry the worst of these. But there is also some very good content and interesting discussion. Forums CompuServe has forums for every known subject. CompuServe send you a booklet with some of these listed.
New forums start all the time.
Browse around until you find some that interest you. Not all the features may be available to you unless you join. To join a forum, sometimes they ask you to click the JOIN box. In most cases there is no fee and no overhead. Joining merely shows that some people are interested in the topic otherwise they will purge it.