The New York Times said Stamos had resigned over differences with senior management over how to handle these issues.
In a tweet posted after the report emerged, Stamos did not directly address whether he would be leaving Facebook by August, but appeared to confirm the part of the report that his internal security duties had been reassigned to other groups. "Despite the rumors, I'm still fully engaged with my work at Facebook".
"It's true that my role did change", he wrote shortly after the Times story broke. "I'm now spending more time exploring emerging security risks and working on election security".
Stamos came to Facebook from Yahoo in 2015, and in June 2016, he had engineers start to look for suspicious Russian activity on Facebook.
"He has held this position for almost three years and leads our security efforts especially around emerging security risks", the company said in a statement. His decision to leave Yahoo in 2014 was at least partly to do with disagreements he had with CEO Marissa Mayer over the company's security standards, which he felt were not strict enough.
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On twitter, Healey told that residents of MA instantly deserve answers to this from Facebook and the Cambridge Analytica. Oczkowski described the potential application actionable data scraped from Facebook users as potentially "endless".
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This isn't the first time that Stamos has left a job seemingly at odds with his bosses.
Stamos made waves on Twitter this weekend when he criticized The New York Times and the Guardian for their portrayals of the way data analysis firm Cambridge Analytica used Facebook user data. By November, they found evidence of Russian operatives pushing leaks from the Democratic National Committee, the Times reports, but that same month, Facebook founder and chief executive Mark Zuckerberg said it was a "pretty insane idea" to think Russia influenced the election. Then, he deleted those tweets.
Neither Facebook nor Stamos directly commented on how long he meant to remain at the company, referring to his tweet in response to queries. In October, he let fly a string of tweets about the news media's coverage of artificial intelligence technology, which he said painted Silicon Valley unfairly as clueless.