In the wake of Christopher Plummer's deathon Friday, Hollywood figures took to social media to share tributes and memories of the Canadian stage and screen actor who died at his home in Connecticut at the age of 91. Well known for his performance as Captain Von Trapp inThe Sound of Music, Plummer went on to earn Academy Award nominations for The Last Station and All the Money in the World, and won the Oscar in 2012 forBeginners.