https://cdnph.upi.com/ph/st/th/7991781097765/2026/upi/74883bb61d1309b9b6dd14466df671c6/v1.5/Jeremy-Strong-plays-Mark-Zuckerberg-in-The-Social-Reckoning-teaser.jpg" /> "The Social Reckoning," a "companion" film to "The Social Network" starring Jeremy Strong as Facebook co-founder Mark Zuckerberg, opens in October.