Once they thought the technology was ready, they deleted all of the accounts that they thought weren’t those of real people, all at once. Millions of Instagram accounts disappeared. Justin Bieber lost 3.5 million fans, while Kendall and Kylie Jenner lost hundreds of thousands. The 1990s rapper Mase dropped from 1.6 million followers to 100,000, then deleted his account entirely out of apparent embarrassment.