Miiverse

Miiverse was a social network and a communication interface accessible to Wii U and Nintendo 3DS users. It was developed by Hatena, an internet services company in Japan popular for their blog-hosting service of the same name, in conjuction with Nintendo.

Being a social network, users could share screenshots of other games they played on their consoles, create drawings and post them, send short text messages between other users, or replay gameplay videos uploaded to the platform.

A Nintendo Network ID created specifically on a Wii U or a Nintendo 3DS console was needed for creating an account or connecting to the platform.

History
Miiverse was first announced during a Nintendo Direct event on June 3, 2012, and on November 18, 2012 (in North America), it was released together with the Wii U as an application available in the Home menu of the console. Some months after its release, a web-based portal was opened on April 25, 2013, and much later, a 3DS version was released on December 9, 2013, due to the popularity of the social network.

On July 29, 2015, the Miiverse app received a huge update that changed how the service worked, among other things.
 * A Play Journal was added, which let players save their screenshots to their own personal album.
 * Sections for posting drawings, and for opening discussions about other games were added to the community.
 * Users started being affected by a daily post limit of only 30 posts per day, and the ability to post to the main activity feed was removed.

At last, on November 7, 2017 at 10:00 PM PST, the Miiverse service was discontinued world-wide at the same time as Wii U Chat, another chatting service. The platform never received a Switch release, despite it having lasted some months online after the console released.

About the app
Being accessed from the Wii U Home Menu, as an extra option to the Wara Wara Plaza (where Mii's made by the user of the console walked around), the app's main purpose was to serve as a communication platform that gave users the possibility of making friends with other users of the same console, and also, letting them find users willing to talk or debate about their hobbies and favorite games.

Until before the July 29 update, users could post short messages and leave comments in their activity feed and make those posts visible to their subscribers. Together with some other media features like sharing screenshots from their TV screen or from either console's screens, unlock black-and-white stamps while playing games, using said stamps on their drawings, and even video record themselves playing on their consoles

Communities
There used to be three different communities, depending on each region in which the platform was released to. These communities being: Europe and Oceania, Japan, and the Americas.

Out of all official users using the app, Aya Kyogoku, an important producer to the, used to be part of the Japan and Americas communities. Where she used to post every so and then to provide new information on the, directly to her fans and subscriptors.

Yeah! Button
As it's common on other social networks, Miiverse also had an equivalent to the "Like" button, that could be used to agree to another user's post. The button, called the "Yeah!" button, could be pressed once to "Yeah!" a post, or it could be cancelled by pressing again on it, while it said "Unyeah".

Even if the button worked in the same way as a "Like" button, the text written on the button itself would change from "Yeah!" to something else, depending on the user's Mii expression at the time of posting. The button would change to:
 * "Yeah!", by default, if the Mii's is normal or happy.
 * "Yeah!?", if the Mii is shocked.
 * "Yeah...", if angry or sad.
 * "Yeah♥", if winking.
 * Or "olv.portal.miitoo", due to a glitch.

Miiverse stamps
They were collectible stamps that could be won by playing certain Wii U titles, and they could be used as an extra tool for decorating handdrawn posts.

The two games that gave out Animal Crossing stamps were Animal Crossing Plaza and Animal Crossing × Mario Kart 8.