Both the Nintendo DS Wi-Fi Connection and the Wii Shop Channel services, WiiConnect24, and any related services and material delivered to your Wii console over the Internet ("Wii Network Services") allow gamers to interact in real time. Both of the Nintendo DS Wi-Fi Connection and the Wii Network Services have been designed with gamer privacy in mind. In order for two individuals to communicate or otherwise interact with each other, they must exchange Friend Codes. "Friend Codes" are unique to each online game and are exchanged by players off-line (by phone, by email, etc.) who are already familiar with one another. Then, when you connect, you are able to enjoy multiplayer gaming with "friends." This avoids open communication with strangers and creates a friendly environment.
If a player connects region wide or worldwide on a Nintendo Wi-Fi enabled connection, they can play with anyone, not just friends. When this option is selected, Nintendo games that include a chat feature limit the chat to only "closed" or pre-canned text. Also, the only information displayed to the other player is game information and the nickname of the other player. No personal information or specific location is provided to the other player. Games in the future may allow players to exchange other information stored on their Nintendo DS or Wii.
To be safe, parents should monitor their children's exchange of Friend Codes to make sure that this feature works as intended. Parents should also monitor any multiplayer game play done through the Nintendo DS Wi-Fi Connection or the Wii Network Services.