BBC News Published People can now enter their phone numbers into a website to see if they appeared in a recent Facebook data breach. Details of more than 530 million people were leaked in a database online, largely consisting of mobile numbers. People can use the Have I Been Pwned online tool to check if their numbers or emails were compromised. Facebook says the data is from an “old” breach in 2019 but privacy watchdogs are now investigating. The data Facebook said it had "found and fixed" the breach more than a year-and-a-half ago. But the information has now been published for free in a hacking forum, making it widely available.