Kids aren't reliable predictors because of a few fundamental lifestyle differences with adults: they don't spend much of their day working away from their friends, and their social network is usually within physically short range. For kids, everything in their lives happens within a short space of time within a small radius.
What works for kids may never work for adults, including the adults they will become, and vice versa.
So it's hard to tell whether the popularity of something amongst kids is a sign of a social change, or just a kids thing. (The latter not necessarily making it a fad, it could work for multiple generations of kids.)
Of course the even less reliable interpreters of such signs are old school dead tree journalists...