Log in to Facebook. ~Click your user name to go to your profile page. On the profile page, click your profile photo. ~Click on the (albums) link next to your user name link ~In the Facebook URL in your browser's address bar, look for the following, keeping in mind that your number will differ: id=0123456789.
The number after the equals sign is your Facebook profile ID.
Updated 01-20-2012 at 06:00 PM by camstuf (Added photo)