The previous stance of some social media like FB was, that they do not need to delete all conversation, because they declare them as valuable content for other users, with whom a conversation was done, not as a content related to only one user, who sent a message.

I wonder how much more stays on FB and other social media, if Afghans request deletion of their account for FB and others. Is it an effective measure at all? How strong is the "right to be forgotten"?