WTF is snapchat for? Get off my lawn.
Maybe because I'm introverted and don't care what my friends are eating? I have no insight into the minds and motivations of young women, so maybe that's part of it too. Dunno.
Yup...things are in fact different now.
There you go.
Insofar as its a substantive experience description and not just another term for Gen Y/Millenials, I'd say if you engaged in substantial online interaction and that it substantially affected the way you approach information, learning, and social interaction, during -- or, a fortiori, before -- high school, then you count.
This would typically be people born 1983 or after. If you are 30, you are more than likely a "digital native".