[pluma]

This is the situation in Germany AFAIK:

If you are issued a document and then manipulate that document (especially if you do so with fraudulent intent and then pass it on as authentic), you are committing Urkundenfälschung ("forgery of documents") which can be punished with up to five years of prison or a monetary fine.

This applies to everything from government-issued identification to sick notes. The exact punishment likely depends on the intent and the type of document in question but forging government IDs is almost certainly a crime.

OTOH Facebook would have to obey certain laws if they want to check your ID, especially as they ask you to send you a full unredacted copy. Germany has a law book called the "Personalausweisgesetz" which defines who may ask for ID and how it has to be handled. That's aside from the privacy laws which already define rules for companies that handle or store personally identifiable information.