Are you sure the "private profile data" wasn't aggregated before it was sold? Either way, selling private data is not something Facebook is actually known to do much (outside of misunderstandings by confused activists/journalists). If you contact me (info in profile) I'm very curious to understand more.
Maybe they bought it from someone violating the terms of setting up a Facebook app? I can't stress that this shit's illegal but I also can't stress how the Cambridge Analytica scandal showed that Facebook had almost no way of regulating this.
