Elsmarc - 8:22 pm on Sep 5, 2011 (gmt 0)
All that matters to me in a forum is that the content keeps increasing (people are participating) and the number of visitors (registered or "lurkers") each day increases over time. Just as important is that threads people start are replied to, especially if someone starts a discussion thread with a question, is the question answered. Each person who keeps a forum online is so different in how they manage aspects such as pruning inactive visitors and such makes active users as a % of registered users a useless number/statistic. Even the number of people online is dependent on the forum topic/focus. If it's a business advice forum it may not have many visitors online during weekends, for example, but during week days during business hours (depending upon how "local" the forum is to a geographic audience) the forum may have 10x or more visitors online than on a weekend day. On top of that, the majority of visitors to a forum do not register at all. They lurk, get the information they're interested in and move on. And hopefully they come back for more information.