"Facebook hired a cybersecurity consulting firm to develop a hacking tool, which cost six figures. Our sources described the tool as a zero-day exploit, which refers to a vulnerability in software that is unknown to the software developers. The firm worked with a Facebook engineer and wrote a program that would attach an exploit taking advantage of a flaw in Tails’ video player to reveal the real IP address of the person viewing the video."

They literally hired a team based on an FBI request to create a zero-day exploit. This wasn't just a "give us information" request. They actively R&D'd a tool for the government.