Meta’s antitrust trial, in which the government contends the company killed competition by buying young rivals, hinges on unknowable alternate versions of Silicon Valley history.

Mark Zuckerberg in federal court Monday was forced to revisit a time when he doubted Facebook would be able to compete in mobile photo-sharing, and decided to buy Instagram — testifying in a trial where the US government is arguing it should unwind that acquisition.

Meta is facing a landmark antitrust case that could result in the tech giant being forced to give up WhatsApp and Instagram.