Nintendo has released a web based version of MiiVerse. You are now able to use a computer or a smartphone to get access. Ironically the 3DS's web browser and the Wii U browser ( I dont see why you would try to use the Wii U Browser) do not work with the MiiVerse. Instead the PS Vita Browser's is capable of allowing you to use MiiVerse on it. It's great when companies support each other like this.
About Moises Garza
Founder of GameLuster. I really enjoy the video game medium and just wanted an outlet to share my thoughts back in 2012. I usually play a bit more Nintendo, basically Smash Bros all the time. Graduated from UTSA and I am now a Solutions Developer for a small tech firm , now with my limited time I mostly do all the boring back end stuff to have the site running. You can reach me at firstname.lastname@example.org more