I added some texts below the username. There you can see what kind of fan he/she is.
I split it into the following sections
< 20 posts : Newbie
> 20 and < 100 posts : Regular
> 100 and < 200 : Die-hard
> 200 addicted
And we have Moderators and Administrator so you can always see how die-hard Weird Al fan is.
The ranks don't have special functions or anything, you can only see how much people are posting
Maybe I'll add a special forum for die-hards only. But I can tell you, there isn't such a forum yet