Cristiano Ronaldo and Lionel Messi are among several celebrities who have lost millions of followers on instagram. The loss appears to be the result of a purge of bots on the platform, with other affected celebrities including athletes and entertainers such as Virat Kohli and Kylie Jenner. The exact reason for the purge and its full scope are not clear, but it seems to have affected a wide range of high-profile accounts overnight.