This tool called "Find Facebook ID" provides an easy and fast way to find the Facebook ID for your profile or a group or a page.
This tool accepts Facebook URL, see the following example URL formats below:
1. Numeric Facebook IDs are needed when retrieving some data from Facebook.
2. You will kinda know your place in Facebook history. For example, we will enter the URL https://www.facebook.com/zuck on the text box below, the extracted ID will show "4" which means he is one of the earliest users or records in Facebook database.