Hipster?

Okay I have been walking around trying to find out what a hipster actually is... But I can't seem to get it quite strait? 

What I have found out until now is that hipsters dress in skinny jeans, t-shirts with mostly bands like the beatles on, plaid shirts, lots of weird jewelry, headbands and much more, especially big nerdy glasses...? But is "hipster" just a way of fashion?

I have read on the internet that most hipsters likes stuff like art, music and other creative things, and also old fashioned stuff. They would hate everything new and popular, I have been told that hipsters hates everything that's mainstream...? Also Hipsters sound a little like some kind of new version of Hippies to me? Like, they like to do and talk about stuff that has something to do with problems in the world like... Kony 2012 as an exaple...
(Wich I think everyone should join! seriously! watch the video on youtube) 

But anyway, is it really true? Are hipsters just a way of dressing, and so on... a social group like punks or goths? Just in a more "hip" way? I have no idea, and it's driving me crazy because some of the stuff I have heard or read shows that I could be a kind of hipster. And it drives me mad not to know what it actually is!?

I have heard words like Ironic, to describe hipsters to, that they are ironic all the time, and call just about everything maintream...?  also there's something about "triangles" and hipsters that I really don't get?? O__o

Does anybody really know exactly what a hipster is, or is there many "flawors" of hipster? Cuz well... lots of stuff makes me think no one totally agrees on what a hipster really is?

I don't know... Maybe I just got it all wrong... but please does anyone know? cuz I'm lost O__o

Also another thing I have been thinking of about Hipsters... I think there's a lot of people talking about hipsters, and saying they are hipsters... so... if there really are so many here? then isn't it about to become Mainstream to be a Hipster? Or is it just me?