Jeremy Strong plays Mark Zuckerberg in 'The Social Reckoning,' a follow-up to 2010's 'The Social Network.' Here's everything we know.

Jeremy Strong as Mark Zuckerberg in "The Social Reckoning." Sony "The Social Reckoning" tells the story of Frances Haugen, a Facebook engineer turned whistleblower. The movie is written and directed by Aaron Sorkin, and is a companion piece to "The Social Network." The movie opens in theaters on October 9. Sixteen years ago, David Fincher wowed audiences with the dorm-room origin story of Facebook with "The Social Network." The movie would go on to earn eight Oscar nominations and three wins…