Any day now MiiTomo will be launching (Japan March 17th, rest of world SOON) and My Nintendo will be up and running in NA and the rest of the regions.
Check out the features of both My Nintendo and MiiTomo on the official website: www.MyNintendo.com . Pre-register there as well if you have not already.
My Nintendo is a Nintendo Account service that connects your Nintendo experiences across multiple touchpoints, from gaming systems to computers and smartphones.
Once the My Nintendo service starts, you’ll earn points by playing apps on your smart devices or buying digital games for your Wii U™ or Nintendo 3DS™ systems.
Think you know your friends? Guess again!
Miitomo™ is a free-to-start Nintendo application for smart devices that uses your Mii™ character to communicate with friends.