Leaked data is considered ‘public, private, & only me’ information/posts on your Facebook account. In 2019 the was a breach that occurred, that compromised Facebook’s vulnerability.
This seem ‘old’ however, this week (April 3, 2021) the leak has resurfaced. It is considered to be a ‘cybercrime forum.’ If you are worried that you have been or suspect you may be a subject to this visit www.haveibeenpwned.com
Through your email/phone number you will be informed, this all was created by Troy Hunt.