Everone now has a "Rank Level", the more you post the higher your rank gets. The ranks go from 0 - 1000 (as of this post). Every rank has a new Icon and the higher rank you are the more prestigious Icon you will get. So keep up the posting!
From time to time you might see some people with "Special Ranks". These icons can not be obtained through leveling your rank, and are given out at my discretion so don't bother asking for one.
