Galaxiki
Galaxiki is a wiki for a fictional galaxy, in which you can buy your own solar system or edit unclaimed planets.
The idea seems a little off to me, because the first thing I wanted when I looked at the website was my own galaxy, not my own solar system. And older shared universes like Orion’s Arm look much more substantial. Since I consider myself of average geekiness, my reactions don’t seem promising for Galaxiki.