"This is a map of everywhere I've been for the last months. Everywhere," he writes on that tech site. "I didn't carry around a tracking device. The FBI isn't sending goons in unmarked vans to track me. All I did was use an iPhone."

He adds: "The data itself is jarringly accurate. Even though it appears to rely on tower triangulation rather than GPS pinpointing (meaning you're not safe with location services switched off), the map I was able to generate with mapping software the security duo released visualizes my life since the day I bought my iPhone 4 in July. Everywhere I've been. Bus trips home. Train trips to visit family. Vacations. Places I'd forgotten I'd even gone. Zoom in on that giant blotch over New York, and you can see my travels, block by block.