Data leakage is serious. Is Facebook still safe? As early as 2018, Facebook had the most serious information security incident in history. Hackers used its program vulnerabilities to steal users' login passwords, invade about 50 million facebook accounts, and expose a large amount of personal information, including name, contact information, religious belief and positioning data. In September 2019, the phone number database of a Facebook user was leaked, containing 419 million records in total. In April 2021, Facebook was revealed that more than 500 million users' personal information was leaked. People should not only ask why data leaks occur frequently on Facebook, but also whether Facebook still has data security?