Stamos said he planned to leave in December after his duties were assigned to others, according to tipsters, but Facebook convinced him to stay for several months both to ease the transition and to preserve the social network's image. It would "look bad" for him to leave, the sources said.

We've asked Facebook for comment and will let you know if it can confirm or deny the move.

If accurate, the departure reveals high-level tension at Facebook over its approach to Russian meddling and other misinformation campaigns -- it shows that some executives might not have wanted to verify the extent of the campaigns or notify users to the degree it has so far. The news certainly comes at a bad time, following right after word that Cambridge Analytica had collected the data of 50 million Facebook users without consent (and that Facebook may have sat on its knowledge of this since 2015). If Facebook really did time Stamos' exit to minimize uproar, it's having the opposite effect.

Update: In a Twitter post, Stamos confirmed that his "role did change," but that he's also still "fully engaged" with work at Facebook. He didn't definitively say whether or not he was leaving, however.