Miiverse (portmanteau of "Mii" and "Universe") is a communication system or social network for Wii U and Nintendo 3DS created by Nintendo Network Business & Development (NBD) and Hatena and powered by the Nintendo Network, which allows players to interact and share their experiences through their own Miis.
The Wii U Menu may also be used to launch applications entirely beyond just gaming: the Miiverse social network which is integrated with all games and applications; the Internet Browser for the World Wide Web; play media through Netflix, Hulu, YouTube, Nintendo TVii, and more; download Wii U software and content through the Nintendo eShop; and receive official notifications from Nintendo.