Companies like Facebook, Twitter and YouTube have come out in support of Black Lives Matter and its mission. But are their platforms undermining the movement for racial justice? Guest: Kevin Roose, who covers technology, business and culture for The Times. For more information on today’s episode, visit nytimes.com/thedaily Background reading: Kevin Roose explains why shows of support for Black Lives Matter from Facebook, Twitter and YouTube don’t address the way racists and partisan provocateurs have weaponized the platforms.