Is this normal? Why?
So yeah, I email my best friends.
You could say this again!
In about 10 years from now, I think the population of what have been described as 'digital natives' would probably hit 40/50% mark (if not higher).
I too think it'd be very interesting to see the state of communication and human interaction methodologies at that point in time.
IMO, (much) greater degrees of convergence and unification are almost certain. In what forms and styles, only time will tell. (And a handful of bright startups with the right ideas at the right times along the way would be the next billionaires :)).
In that order probably: Phone call, SMS, Gtalk, Skype, Facebook, Email
EDIT: I do chat to friends on Gmails chat.