As an FYI-that's also law in the U.S. No one is allowed to take a picture of another person without consent.
Well, that is not exactly true. If you are in a Public area and have no reasonable expectation of privacy, then any case you bring will likely be tossed out unless the photographer is realizing financial gain and it is shown that you are the focus or purpose of the picture. There is even an exception for photographs of "newsworthy" endeavors, or in the case of celebrities, that the photographs are in the public interest. This does not even begin to get into surveillance cameras and a multitude of instances.
In Europe they have also indicated that it needs to be informed consent, meaning.."do you mind if I take your picture?" is not sufficient, you also need to inform them of your intent for the picture, and as someone mentioned, if they later object to the picture being on your Facebook post, your are in violation of the regulation and must remove it, and likely take action to assure that it is removed from all platforms.
Again, will any of this ever take hold? Would they really go after your Facebook page? The Eu has a history of passing sweeping regulations that then get bound up in bureaucracy, and then sometimes fade away, or get more rules tacked on and wind up more mainstream.