Will there be some kind of profile system in-game?
If so, you could put the URL to your preset downloads in that, so even if you meet new people in the game, they could easily get your preset and see you 'properly' without having to contact you some way outside the game to get the link.
Not everyone is active on the forums for games, after all, and some people wouldn't want to give out their IM names or emails just to share a link.