The german term you want to look for is "mittelbare Drittwirkung". On this particular topic there is an interesting case from the Bundesgerichtshof about facebo

The german term you want to look for is "mittelbare Drittwirkung". On this particular topic there is an interesting case from the Bundesgerichtshof about facebook accounts that were banned. German press release: https://juris.bundesgerichtshof.de/cgi-bin/rechtsprechung/document.py?Gericht=bgh&Art=en&Datum=Aktuell&anz=1&pos=0&nr=117106&linked=pm&Blank=1 https://juris.bundesgerichtshof.de/cgi-bin/rechtsprechung/do...