It might not be unfair to say that what was emo culture in the mid-2000s has evolved into hipster culture (mainly, for example, not being part of the most mainstream or traditionally popular groups, and in many ways opposed to the ideas and values of those groups and most people in general, and indeed disliked in return my most people), and they have a very easily identified sense of style, but they are not that similar in other ways.
While colored by a vitriol against many of the most mainstream aspects of popular culture (actually an area I agree with them, since popular TV and music has a tendency to be awful these days). The irony usually refers to them wearing shirts or the like referencing something that was once, but is no longer popular (or, for example, a DARE shirt, which was a popular anti- drug program in American schools). They tend to smoke and do at least some recreational drinking and drugs and are usually around 20. They don't dwell on sad or depressing things like emos, but instead are often obsessed with earning and maintaining a sense of smug superiority, usually colored by keeping up with the very newest, most obscure music or most unknown clubs. For some hipsters, it feels like this pursuit of the unknown is more important than the music itself, which is sometimes itself pretty bad, but embraced just because it is A) obscure or B) popular within the hipster community (that old anti-conformity conformity thing). Hipsters tend to be somewhat unforgiving of people less informed of stuff like that than they themselves are. They wear unusual combinations of impractical clothes, often flashy or even intentionally gawdy accessories or prominent but non-prescription glasses. To some degree their music elitism tends to bleed over to movies, but not nearly as much. Sometimes they'll watch reality shows or the like described as dumb in that ironic way, but it seems like a waste of time (or, with bad movies, money) to me. Sometimes I wonder if it's just a way of publicly embracing guilty pleasures. They are pretty unfailingly very liberal (they really embraced Obama, and pretty early on, something else I share with them), but most of them don't really know much about politics.
It seems to me there are both genuine hipsters and people who just want to be in the sort of cool new thing, more in love with the idea of being a hipster or emulating and even surpassing their hipster friends than care at all about the ideas hipsterdom really represents.
And I agree with Marm. MOST hipsters are probably SP or SJ.