"Deepfakes are becoming more difficult to detect as the technology used to create them advances, said Hany Farid, a computer science professor at the University of California, Berkeley, who has a financial stake in Truepic and whose research on media forensics has been funded by Darpa. Mr. Farid said it is worrying that social-media companies aren’t doing more to combat deepfakes, particularly in the wake of Russian interference in the 2016 presidential election, which Moscow has denied. 'These platforms have been weaponized, and these aren’t hypothetical threats,' he said."