Wait, they don't like people sharing friend codes on forums either?
I've never understood this. Posting your FC causes no harm if you don't agree to add someone else's FC to your system in return. What am I missing?
I believe Nintendo of America shut down their official forums over it back when the first DS games that required friend code exchange appeared.
Nintendo tries very hard to promote the image of children being 100% safe from the wild Internet when using a Nintendo product. Their idealized scenario involves a child going up to a parent, asking politely if they may be given the friend code of their playmate from next door, and the parent dutifully talking to their neighbor to set up this harmless bit of fun for both kids.
Were it that easy, and if only parents would actually doing their job of parenting rather than not caring until there's a problem - then run screaming to companies and the media about Little Jimmy getting dickporn on his internet device.
But Nintendo is also kind of delusional about their ability to control this and too afraid of dealing with the PR repercussions. The fact that Miiverse exists indicates they know these kinds of communication capabilities are required and they've no choice but to get with the times. But they're trying their best to have it all happen strictly on their terms, covering their ass at the expense of greatly inconveniencing their users during times like this.
It is for example a reason why I feel they're dragging their feet on industry standard digital software accounts. Many think they're just stupid and Iwata can't find the app store on his iPhone. I think it's nothing like that and they know exactly what they're doing. They're terrified of Little Jimmy being socially engineered and giving his Nintendo account password to his friends, who proceed to log in, steal his account, and buy a thousand bucks worth of digital games. They don't want to deal with that PR problem and customer service load.