David Karp- Bronx Science grad-turned Tumblr chief

Marc Cenedella- TheLadders.com, formerly of down market Hotjobs

Rob Kalin- the flame-haired chief of Etsy, an online marketplace for handmade goods

Scott Heifernan- started MeetUp, a site that allows users to find each other in any city, can be found at any NY tech event

Jon Oringer- founded photo archive Shutterstock, worth over $500 million, enough to buy Mort Zuckerman’s house in Aspen

Jack Dorsey- Twitter founder frequently hangs in NYC, tweets with Bloomberg

Justin Shaffer- Hot Potato CEO, once ran new media for Major League Baseball

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