An activism triple threat, Mark Ruffalo tackled fracking, male breast cancer, and the Catholic Church this year on social media. Baring his chest on Instagram, he helped get #InTheNipofTime trending for male breast cancer awareness, and starred in Spotlight, the biopic about breaking the news on the sex abuse scandal in the Catholic Church—he’s been outspoken about the hypocrisy of the church during the film’s promotion. In 2015, he tackled feminist issues by reblogging a Tumblr post that questioned women who didn’t identify as feminist and continues to be a vocal anti-fracking pundit with his non-profit organization Water Defense.