Miiverse is a social website for players, using Miis as profiles. You can join certain communities (different games) and post comments on them, screenshots, post Stamps (Stamps were not always accessible, but thanks to an update, they are now), and add drawings. Other users can "Yeah" your post (basically a "Like" as on Facebook) and comment on it, too. You can follow other users to see their post and send and receive friend requests.