Our characters are not typically one-dimensional, and not just living in the moment. Most of us have thought up multiple story elements to give them life, history, and depth. Whether they be how they spent their time living in a certain city, building their reputation up a certain way there, or how they might hold some kind of weekly/monthly/annual event that everypony in a town or city might know of, all of these help to make things more interesting.
So what is this thread for then, you ask?
Basically, it's for forum-wide resources.
It's for listing certain things about a character in an easy, bite-sized manner, things that perhaps a town or city might know about them as they've lived there almost their entire lives, or events that they might have held that would have made a name for themselves. It's, much like I said a moment ago, for creating resources for other members to incorporate in RP, either by giving them ways or locations to meet, or things to discuss in threads.
For example, for one of my characters, Slash Zephyr, I might mention in here that some thirty years ago when he settled down in Ponyville he helped establish a blacksmithing and tailoring shop with Patches. Or, for my character Honey Dew, I could say she has played her violin in various shows and events while growing up in Ponyville. The first example provides a location that might otherwise be unknown to anyone who didn't even know he existed, and the second provides opportunity for previous connections to be made, or even some kind of conversation starter. This thread could even, as the name of the thread suggests, be used to post several rumors about what citizens might be saying about your character--whether they be true, ambiguous, or farfetched.
In all, I just hoped to create something that would help the forum grow a little bit with some story elements to flesh it out some, as well as the characters within it.
Sister thread for Ponyville: http://rpismagic.createaforum.com/general-discussion/rumo%28u%29rs-abound-ponyville-edition/new/#newThread is admin approved! ;p