The government is expected to question Mark Zuckerberg over emails he and other executives sent about the purchases of Instagram and WhatsApp. | Pool photo by Julia Demaree Nikhinson Meta CEO Mark Zuckerberg became the first witness to testify Monday at the Federal Trade Commission’s landmark antitrust trial that seeks to break up his company. Daniel Matheson, the FTC’s lead lawyer, spent the first hour trying to pin down Zuckerberg on the “core value proposition” of the social media giant — sug...