Everything changes as time goes by, especially the discussing style of a forum/BBS.
What we can do is to keep some core users who love the forum/BBS very much and
have positive personalities, and are willing to help others in this forum/BBS,
and to try to attract more and more users.
You can be seriously.
But you should not be seriously too much.
You can lead the topics and discussing style.
But you can not control them all the time.