Nicole Voulgaropoulos and her mom, Sheryl Green-Voulgaropoulos, pose in front of Facebook’s thumbs-up sign as Mel Voulgaropoulos, her father, photographs them in Menlo Park, Calif., on August 31, 2018. Nicole was at the time a new Facebook employee and her parents had come for a visit. Access to the company’s campus is restricted and the sign, the area that welcomes visitors without an employee connection, has become a popular place to sightsee and take photos for people who visit Silicon Valley.