You may have noticed you have pips beneath your title. As you post more, you get more pips. They are as follows:

1 Pip: Newbie, 0 posts
2 Pips: New User, 10 posts
3 Pips: Regular User, 40 posts
4 Pips: Advanced User, 75 posts
5 Pips: Veteran, 150 posts
6 Pips: Legend, 250 posts
7 Pips: Elite, 400 posts
8 Pips: Idol, 600 posts
9 Pips: Icon, 800 posts
10 Pips: Ultimate, 1000 posts
11 Pips: ???, 1500 posts