From the Super Mario Wiki
Miiverse is a stage in Super Smash Bros. for Wii U, released with the version 1.0.8 update on June 14, 2015. Its layout works in the same way as Battlefield, but with many visual differences. The stage is centered around Miiverse, with the platforms and background designed to match those of the Miiverse interface. Certain user-created images appear in the background to cheer the fighters on. Users are able to post cheer messages for specific characters to Miiverse by posting in special "support" communities made for every character, which can be chosen to appear when that character is in a match. This is the only downloadable stage that cannot be played online or with more than four characters.
Starting November 7th, 2017, community posts are no longer displayed due to the Miiverse application being shut down; however, the stage itself is still playable.
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