Dear Sipher,
Hipsters are emo people. Well, to put it more accurately, they were emo people, but emo's day in the sun has long since passed, so they moved on to the next closest thing.
I, for one, eagerly anticipate finding out what the next stage on the emo/hipster evolutionary scale is. I hope it's some sort of wannabe redneck. I guess New Yorkers will find out first.
Love,
Giorgio Armani