On April 24, 2013, thousands of employees were working at a garment factory in Bangladesh, unaware of the danger around them. When the factory suddenly collapsed, a minimum of 1,120 people were killed; the number could be higher, as it proved difficult and time-consuming to sort through the rubble. Authorities do know that more than 2,510 people were hurt. While there were minor injuries, many of those injuries were permanent and potentially life-altering.
Facebook makes money by running ads, and those ads are based on what users want to see. The more that Facebook can learn about what its users are interested in, the more accurately they can display those ads, which can help with revenue.