Advocacy groups are demanding the social network disclose how it reviews Spanish-language content and appoint a high-level executive to oversee policy and enforcement in Spanish.
The three-year deal came weeks after Facebook briefly blocked Australian news outlets' content on its platform to protest a change in the country's media law requiring the company to pay for it.
Research from New York University found that far-right accounts known for spreading misinformation drive engagement at higher rates than other news sources.
The announcement came just as Google reached a deal with Australian publishers and as the president of Microsoft urged U.S. regulators to copy Australia's proposal.
Days after a coup and the detention of Aung San Suu Kyi and other elected leaders, the country's military is moving to strangle free speech by shutting down access to social media sites.
As Twitter and Facebook crack down on those spreading baseless QAnon conspiracies, adherents are finding other apps to communicate on, including platforms where they may be further radicalized.
An image that seems to threaten former President Donald Trump has prompted Twitter to deactivate an account linked to Ayatollah Ali Khamenei. The image also appears on Khameini's website.