Ok, now I don't play a lot online with other people, but I do know that Talonman put a lot of hard work into the codes feature of this site. But I keep on seeing threads like "Official FC thread for game X" or people posting their gamertag/psnid in their sig.
Each Wii/DS game that uses FC's has the ability to store your FC right on the game page. And then when you go into the Owners section of the game, it lists everyone's FC. Also, you can click on someone's profile, you can see all their codes/tags/id's on the right and above their game collection.
Not only this, but if you use the VGChartz sigs, your console code/tag/id can be displayed right on the sig as shown below
So why don't you use the codes feature on this site?