[KaVir]

I use generated descriptions, so I avoided that problem. However that didn't stop players from scrawling their names across the landscape using buildings or by planting crop fields.

So now I just give every player their own customisable world. You still get mountain ranges spelling out offensive words, and rudely shaped islands, but at least the players can't mess around with the main world.

One major problem with player generated content is that the more freedom you give, the more it can (and will) be abused. If you've played Spore, you'll know the sort of thing I'm talking about!