Facebook Founder Mark Zuckerberg drilling screws on a new Ford F-150 during his visit to the Ford Rouge Plant in Dearborn April 27. His first trip to Michigan included working on the assembly line — which he said was physically hard — and then meeting with the workers whose day-to-day job is to work at the plant. Zuckerberg shared the details of his visit on Facebook where he said he signed the inspection sticker on one of the trucks he worked on.