2011 30 under 30

Could someone <i>please</i> tell me why Hipmunk is so...well, hip? Why are they mentioned in the same breath as Dropbox, for example?

I wonder how much ad revenue inc mag gets from these types of linkbait fluff pieces?

Although I am pleasured to know many of these guys, i am surprised to see so many IT companies in the list. I'd love to see more stories similar to nom nom truck...

Interesting that so many companies featured here seem to have single founders (13 by my count).