When new Facebook employees start at the company, there's always been one person to publicly greet them: Chris Cox.
Every Monday, Cox has welcomed new hires at the headquarters in Menlo Park, California, as part of their orientation. He would talk to them for half an hour or more, explaining Facebook's mission to connect every human in the world, according to former employees.
Cox's resignation from Facebook, which the company announced on Thursday, marks the departure of not just its chief product officer but also one of its most popular executives. One ex-employee, who asked not to be named, said Cox was viewed by many as "the heart and soul of the Facebook mission at the company."
"He was an incredible story teller and could bring you to tears when talking about new features and how important they were," a former Facebook executive told CNBC.