Swapnote doesn't exist as a private messaging platform anymore. So far no game that I know of has a system that is like swapnote that allows a little freedom of expression. So friendcodes kind of left the private info bracket. Sure it's a bunch of numbers that can be traced to you as a person but it still makes no sense. I just play games with people. Swapnote was nice and I am enjoying Miiverse. I don't mind miiverse being a public forum on 3DS, it's fun -- it's just my 3DS friendcode is not like my email or my Nintendo ID. Friendcode or friend request, either way you still have to varify.
I can't wait to access Miiverse on my phone, maybe the friend request feature would be available?
By the way, is it against the rules to put my FC on my profile comment?