If it looks like facebook.com/profile.php?id=1234567890 , the numbers after id= are your Facebook ID. 2. The "View Page Source" Method (For Custom Usernames)

is a permanent, numerical shadow. It is the raw data of your existence in the eyes of the algorithm. The Numerical Soul

Go to the Facebook profile or page you want the ID for.

Yes. Any Facebook user can view your FBID by using the “View Page Source” method on your public profile. It is not considered private information by Meta, as it is used for API lookups.