User Titles 
The user title manager allows you to set up a 'ladder' of titles that can be applied to users based on the number of posts they have made.

For example, when a user registers he may be given the title 'Junior Member', then when that user has made 100 posts he could be granted the user title 'Senior Member'.

The numbers of posts required to climb each 'rung' of the ladder, and the actual titles given are entirely up to you.
User Contributed Notes: User Titles Add a Comment