"Hany Farid, a professor at UC Berkeley and image-forensics expert whose lab received a grant from Facebook related to its deepfake detection research, said the competition is a big step toward solving an important problem. He said Facebook will also need to keep in mind that any technological solution must change over time, similar to the ways technology advances for stopping spam and computer viruses. 'It's always evolving because our adversaries are always evolving,' he said. Beyond that, Farid thinks Facebook needs to make some decisions about its policies regarding false videos."