Wii U - WaraWara Plaza and Wii U Chat [Video]
No more friend codes!
Also, they said they plan to bring this service over to other consoles, we all know that the 3DS is one of them but is there a chance that we'll see this come to the Wii and DSi? Or even regular DS?
(They could add regular DS support by allowing you to enter your Nintendo Wi-Fi Connection ID to the new network, as they used to do with their website)