Post wherever. I don't know in what direction you want to go with this, so it's up to you.
I think I'm going to use the world that I've described in my GENEX superhero RP. You can check out that information in my o/o. Don't be afeared, though; I will not be using any PCs (or making my NPC look really good-- unless I use Conqueror as a villain, and that would be really mean!).
As for the setting: San Francisco.
All of you should be independent superheroes (but I will allow cohabitation between you, i.e., room mates, lovers, etc., that creates a loose affiliation); all of you should at least know of each other, unless of course one of you is VERY new to the game (like, you just got your powers yesterday). I'm not a bigot, but please understand that if you're specifically a gay male superhero, or you're a straight superhero and associate with a gay superhero, the public will NOT receive you well (but it won't be so bad if you're in San Fran!).
To create a sense of camaraderie between heroes, I ask that everyone get together with everyone else and create a web of previous adventures. All superheroes must at least have 3 previous adventures with each other superhero.
Superhero 1 and 2 both stopped a bank robbery.
Superhero 1 and 2 also prevented the mayor from being captured.
Superhero 1, 2 and 3 both captured a domestic terrorist.
The web between superhero 1 and 2 is fulfilled; they have three previous adventures. However, the web between superhero 1 and 3 is only a third-way fulfilled.
I hope to have at least 3 players, but no more than five!
Also, please, please, please let one of those players be a woman!