Mark Zuckerberg is trying to understand America, so he's embarked on a journey to meet people like hockey moms and steelworkers who don't typically cross his path. But there are rules to abide by if you are an ordinary person about to meet an extraordinary entrepreneur. From a report: Rule One: You probably won't know Mr. Zuckerberg is coming. Rule Two: If you do know he's coming, keep it to yourself. Rule Three: Be careful what you reveal about the meeting. While the Facebook CEO has built a social network that inspired people around the world to share the most intimate details about their personal lives, his team goes to extraordinary lengths to keep his movements under wraps and control how he is perceived. Midway through a "personal challenge" to travel to 30 states he'd never visited, the 33-year old aims "to talk to more people about how they're living, working and thinking about the future," he wrote in January on his Facebook page. Among those people was Kyle McKasson, manager of the Wilton Candy Kitchen, a century-old shop on the town square in Wilton, Iowa. He was at work one Monday afternoon in June when two men and a woman dressed in jeans and button-down shirts entered the store, which is a regular stop on Iowa's presidential campaign circuit.