VR is kind of a gimmick, but AR will, 100%, be the next frontier of human-computer interaction. It sparks the imagination in an extremely tangible way.
FB succeeded because it was in the right place at the right time. Sure, it positioned itself cleverly, but the moment in history was ripe for a social media company.
Things don't just succeed because they spark the imagination or because you work really hard at them: they succeed because all the factors beyond your control are aligned, too.
With the obvious example being : parking instructions while driving a car