This is the simplest no-login-required method. By viewing your own profile picture in full size and copying its URL, the FBID appears as a numeric string in the path. For example: https://scontent-lhr8-1.xx.fbcdn.net/v/t39.30808-6/273456789_123456789012345_987654321012345678_n.jpg The long number ( 123456789012345 ) is your FBID. This works because Facebook serves images via a content delivery network (CDN) that uses the ID for file routing.

Now you know exactly how to answer the query —whether you are on a desktop, mobile, or working with Pages and Groups. The fastest method remains the View Page Source trick, which takes less than 30 seconds once you are comfortable with it.

Finding the ID for a business or fan page is even easier than a personal profile. Navigate to the Page. Click on the tab. Scroll to the very bottom of the "Page Info" section.