Byrne joined Meta in September 2021.

She and her team helped draft the rulebook that applies to the world’s most diabolical people and groups: the Ku Klux Klan, cartels, and of course, terrorists. Meta bans these so-called Dangerous Organizations and Individuals, or DOI, from using its platforms, but further prohibits its billions of users from engaging in “glorification,” “support,” or “representation” of anyone on the list.

Byrne’s job was not only to keep dangerous organizations off Meta properties, but also to prevent their message from spreading across the internet and spilling into the real world. The ambiguity and subjectivity inherent to these terms has made the “DOI” policy a perennial source of over-enforcement and controversy.

A full copy of the secret list obtained by The Intercept in 2021 showed it was disproportionately comprised of Muslim, Arab, and southeast Asian entities, hewing closely to the foreign policy crosshairs of the United States. Much of the list is copied directly from federal blacklists like the Treasury Department’s Specially Designated Global Terrorist roster.

Byrne tried to focus on initiatives and targets that she could feel good about, like efforts to block violent white supremacists from using the company’s VR platform or running Facebook ads. At first she was pleased to see that Meta’s in-house list went further than the federal roster in designating white supremacist organizations like the Klan — or the Azov Battalion.

She was also unsure of whether Meta was up to the task of maintaining a privatized terror roster. “We had this huge problem where we had all of these groups and we didn’t really have … any sort of ongoing check or list of evidence of whether or not these groups were terrorists,” she said, a characterization the company rejected.

Byrne quickly found that the blacklist was flexible. "Meta’s censorship systems are “basically an extension of the government…”