Stamos is reportedly leaving after a fight among executives over how Facebook should deal with disinformation on the social network.

The social media giant is looking for improvements that focus on abuse detection, anti-phishing, password authentication and user safety.

The tech giant complied with a directive from the U.S. government in 2015 that allowed the National Security Agency and Federal Bureau of Investigation to scan hundreds of millions of emails for a certain string of characters, according to three sources Reuters spoke with.