Friend codes? I mean I guess you could consider a user name a friend code since you need to remember your friend's NNID in order to find them without searching through communities for their posts.
Honestly the way you add people on the Wii U (through Miiverse, you can do it through your friend's list but I personally never use that) is pretty much straight forward and hasnt caused any problems for me with playing Online with friends and strangers around the world a-like. Just earlier today I was playing online on CoD: Ghost on the Wii U and I got a few notifications telling me a few of my friends were playing too, I didnt play online with them but if I felt like it I could do it pretty easily.
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