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.
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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.