Inside Facebook's building 14, just a door down from Mark Zuckerberg's office, Kevin Systrom and the Instagram team plot the future of their beloved photo-sharing app. It's no coincidence that Systrom is just a 15-second walk away from Zuck, close enough to stroll by the all-glass "aquarium" where the CEO entertains such visitors as former secretary of state Condoleezza Rice. Even in the meritocratic world of Silicon Valley, proximity to power matters. Systrom and Zuckerberg usually meet three times a week, chatting about mobile products or promising startups--"Just two guys hanging out who really love tech," Systrom says. Looking for another sign of Instagram's juice? Its work space, spartan except for some vintage cameras, is quite close to the company's on-site barbecue joint, prime access to good brisket being almost as critical as access to the Facebook cofounder.