Jeremy Strong argued with Aaron Sorkin in-character as Mark Zuckerberg over this one line in 'The Social Reckoning'

Jeremy Strong as Mark Zuckerberg in "The Social Reckoning." Sony Jeremy Strong uses a Method style of acting in which he fully immerses himself in the character he's playing.

Playing Mark Zuckerberg in "The Social Reckoning," Strong talked and acted like the Facebook founder off the set.

To director Aaron Sorkin's shock, Strong was also Zuckerberg's biggest defender.

Jeremy Strong is known for his intense Method acting on set.

But even "The Social Reckoning" director Aaron Sorkin was surprised by how all-in Strong went in embodying Mark Zuckerberg .

Sorkin, who had worked with the acclaimed actor on two of his previous directing efforts, "Molly's Game" and "The Trial of the Chicago 7," wasn't shocked when Strong showed up on " The Social Reckoning " set speaking and acting like the Facebook founder.

But Sorkin never imagined Strong would end up becoming a staunch Zuckerberg defender in the process.

"I knew he's a very immersive actor," Sorkin told Business Insider .

"I never heard him use his own voice.

He only spoke as Mark, he only behaved as Mark.

But I didn't expect that he was going to be a constant defender of Mark.

Not just on the set, but the emails I would get at night at the hotel." Sorkin said this continued even in post-production, when Strong, still in-character as Zuckerberg, argued with his director over a line in the movie.

"The Social Reckoning" tells the story of former Facebook employee turned whistleblower Frances Haugen (Mikey Madison), who leaked hundreds of thousands of documents to Wall Street Journal reporter Jeff Horwitz (Jeremy Allen-White) that revealed Facebook's algorithm was designed to spread inflammatory content and encouraged extremism, at the expense of users' safety and mental health.

Jeremy Strong and Aaron Sorkin.