In a recent interview with YouTube personality iJustine (translated by Nintendo Senior Product Marketing Manager Bill Trinen) Miyamoto said, "You'll be able to see what happens when other people play your course or when you play other people's courses. There will be some popularity rankings for the most popular courses and things like that. So there's a lot on the community side."
Miyamoto hopes you won't forsake those in your own home though, elaborating that he still pictures couch-based play, with a creator handing off their level to a friend or family member who is in the room. "But of course we will have the internet ability to exchange courses as well." We can't wait to see all the age-appropriate and completely family-friendly designs that the internet will come up with.