Which 2016 superhero film broke new ground in digital marketing by having its lead actor stay in character across social media platforms for months before release?

The film and television industry has dramatically transformed its marketing strategies in the digital age. From social media campaigns to immersive online experiences, studios have pioneered innovative ways to promote their content and engage audiences. This trivia question explores a groundbreaking digital marketing campaign that changed how studios connect with fans and generate buzz for major releases.

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Deadpool (with Ryan Reynolds maintaining the character's irreverent persona across Twitter, Instagram, and YouTube)
Doctor Strange (with Benedict Cumberbatch sharing 'mystical' content and optical illusions on social media)
Suicide Squad (with Jared Leto sending bizarre 'Joker' gifts to castmates and documenting it online)
Captain America: Civil War (with Chris Evans and Robert Downey Jr. engaging in a mock 'civil war' on Twitter)