Miiverse

Miiverse is the Wii U's social network, integrated into software such as WaraWara Plaza (bustling plaza) to bring people together, communicate and comment on certain games and software. The network is built similarly to Twitter, as players can like, dislike, flag, and befriend other people and their comments. Miiverse is also set to become an application for the Nintendo 3DS, smartphones, PCs and tablets later on in the year, allowing the player to answer questions and receive tips even when on the go.

New Super Mario Bros. U
New Super Mario Bros. U is the first main Mario title to incorporate Miiverse. Miiverse in New Super Mario Bros. U will be used to create comments on specific courses that either inform, advise, or comment on the course itself. Players will also be able to use Miiverse to create snapshots/replays of their accomplishments or results of Challenge Mode or Boost Rush Mode and post it on community forums.

Nintendo Land
Miiverse in Nintendo Land works similarly to Miiverse in New Super Mario Bros. U, with the ability to take snapshots of the results of attractions and being able to post comments on the plaza to inform, advise, or communicate with other players.

Mario Installments with Miiverse
 

Other Installments using Miiverse operations
NOTE: Games shown below are not directly related to the Mario game series overall, but do give references to the series in certain parts of the game in question.