Axios Pro Exclusive ContentMark Zuckerberg on Jan. 31, 2024 on Capitol Hill. Photo: Tom Williams/CQ-Roll Call, Inc via Getty ImagesThe Federal Trade Commission and Meta will square off in a long-awaited antitrust trial on Monday over the tech giant's past acquisitions of WhatsApp and Instagram.Why it matters: The trial will be a major test of the FTC's ability to take on tech behemoths for allegedly breaking antitrust law and comes as Meta CEO Mark Zuckerberg tries to cozy up to President Trump....