EU Court of Justice ruling may spell the death of social like and share buttons

How are they not a (joint) data controller in that respect?

BTW, the article didn't actually spell this out, but the website operator's "responsibility is, however, limited to the operation or the set of personal data processing operations for which it actually determines the purposes and means, namely the collection and communication by transmission of the data in question." (translated using Google Translate from the French-language version of the judgment)

In another POV: you are sending users and their data to FB by them using the share button you added to your site. YOU. The fact that FB is doing the same in violating the laws is separate. Now FB will create a new button

From the press release: The consequence of embedding that button appears to be that when a visitor consults the website of Fashion ID, that visitor’s personal data are transmitted to Facebook Ireland. It seems that that transmission occurs without that visitor being aware of it and regardless of whether or not he or she is a member of the social network Facebook or has clicked on the ‘Like’ button.