SplatNet is a convenient online hub for all your Splatoon needs. It was previously only available in Japanese, but since today you can also access an English version of the site. On there you can find information about the stage rotation, your friends’ online status, your own rank, and the gear you last used when playing online. You can use your NNID to log in and then also link your Twitter account to this NNID. That might come in handy if you’re trying to get your friends together for a squad or private battle!
— Nintendo of Europe (@NintendoEurope) 6 oktober 2015