I just don't see a social networking app doing well for them, given how many already exist and it's not what Nintendo is known for. I can't see many people who don't own consoles or such being attracted to such an app, tbh. I don't feel it takes advantage of Nintendo's strengths, or what would draw people to a Nintendo app
It isn't much of a social app per se, think of it more like a Sims-lite kind of thing.