Installed the miitomo app. I was very surprised about the text to speech on top of being able to adjust the settings. Furthermore being able to add in your own greeting/goodbye message is a nice touch.
Took me awhile to figure out how to answer more questions (click your mii character when they are walking around in the room). Some of the questions are ones I've been asked many times but others as questklonoa said...can be a little personal. Some questions are a bit time sensitive asking about events 'this weekend' or something funny recently. Ultimately passing your mii around and actively listening to someone's mii chat your ear off could be insightful for making a longer lasting friend (or super short if you discover they are crazy or your opposite).
I don't really agree with the Dreamer personality I ended up in...maybe it's just Nintendo being silly as usual or a sub-par translation from Japanese to English.
Miitomo s another layer of miiverse interaction but targeted to RL friends. All in all it's an interesting app but I fail to see the reason to log in regularly; it's not a chat program or holds any minigames afaik. It could be a conversation starter irl situations. I'll likely log in when I'm bored at home and in between tasks but it's really very close to just being uninstalled.