Miitomo: What on Earth is it?

Ben at GameSpew writes: "If you have a smart phone or some sort of mobile device, a tablet or whatever, as well as a presence on social media, you’ve most likely heard of Miitomo. You may be like me, suddenly seeing all of these posts on your timeline depicting Miis alongside a set of personal traits, thinking, “I thought the Wii was dead, are the Miis finally sentient and taking over as we speak?” Surprisingly, no! Nintendo have recently had a go at developing their own social platform through use of everyone’s favourite digital avatars, Miis."