South Africa’s Information Regulator, in what is seen as a preemptive move for if it picks a fight with Facebook, on Thursday gazetted the necessary notice to turn on a relatively obscure sub-section of the Protection of Personal Information Act on 1 July, when more headline-grabbing provisions of the law also come into effect. Business Insider reports that the effect is a ban on the processing of some types of personal information including “any unique identifiers” – a telephone number for instance – “for a purpose other than the one for which the identifier was specifically intended at collection”. That, the publication reports, happens to be exactly what the regulator has warned Facebook not to do with the telephone numbers of South Africans collected by its Whatsapp service.