Ok well
I know Town Hero is based on number of accepted solutions now (need 15)
Still waiting for my people of public clarification next 
Hey @kav2001c,
Great question and you're right we don't really divulge on how our ranking system works
(This is done on purpose of course so we can avoid gamification)
However here is some clarity I can share with you:
Public Mobile - @NDesai got this one - PM Staff Members (Moderator or internal employee)
Oracle - @Korth nailed it in his post (They also unlock some cool features)
The below rankings are based on your contribution with-in the Community. The more you contribute the more rankings you can unlock. As @NDesai mentioned in his post: "They are not random. They are levels based on badges you have unlocked, bravos you have earned, accepted solution comments etc."
Mayor
Deputy Mayor
Great Citizen / Super Citizen
Model Citizen
Good Citizen
Great Neighbour
The retired ranking is used for accounts which are no longer active in the Community.
Retired - closed account/ No longer part of the Community
@Korth to answer your question, "What does PM do when faced, for example, with a respected member who creates many helpful and informative posts (which are quoted and linked all over the place by other members) yet eventually joins the Dark Side and becomes an annoying greedy spammer/troll whose account must be denied?
We have a process in place to try and communicate with the Community member, if all else fails and the Community member does not abide by the Community terms and conditions, then we would have no choice but to ban the account. While Banning the account, the original posts will still remain active in the Community, however, the user loses access to the Community.
Hope this helps?
Jeremy
