Do you usually look into topics that have good engagement by the members on your forum? It's something that's usually common in a forum to have one particular topic that holds a big interest to members which they can't stop discussing on it all the time.
Which topic drives the biggest engagement on your forum? Do members usually stay on topic in it or drift on the subject?
Which topic drives the biggest engagement on your forum? Do members usually stay on topic in it or drift on the subject?