Obtaining My Facebook Profile ID
In this documentation, we shared the steps for finding your Facebook Profile ID.
How To Find Facebook Profile ID
Sometimes, Facebook do show you the profile ID on the URL bar as shown in this screenshot. So, you may just use the profile ID displayed there.
However, if the profile id is not displayed, you may use View Page Source option from the browser. To open up the page source, you can either use Ctrl/Cmd + U or right-click and click on View page source.
In this source page, search for profile_id tag in the code. You can use Ctrl/Cmd + F to launch search feature on your browser.
So, this is the Facebook profile ID for Jack Sullivan: 100007881675373.
Hope this helps.