Ah, something that has not been brought up in the CQ&F yet, and something that hasn't been added into anyone's profiles as of yet. It's the Nintendo Network ID, which is needed if anyone wants to add other people on their Wii U console.
So we already have PSN username, XBOX Live username, Wii number, 3DS Friend Code and Steam IDs which we can fill in while editing our profile, but... where's the Nintendo Network ID? It must be invisible. xD
Ah well, looking forward to seeing it added sometime in the future. ^^