There are two ways to create Facebook QR codes.
The first way is using your FaceBook profile https://www.facebook.com/jeroen.steeman, only enter the 'jeroen.steeman' part. This will activate a web page to the profile.
Another way will open Facebook app if installed on the scanning device. For this your profile ID is needed. In this case enter it this way 'qr?id=558767781'. To get your Facebook account ID search the web, there are many examples.