Rather than revealing an advertiser targeted you by your phone number or email address, Facebook may tell you it showed you a particular ad because you like Facebook. That's not much help.
The British Election Study results have called the notion of a 2017 'youthquake' into question. But that doesn't mean parties will abandon social media campaigning any time soon.
Our whole system of political campaigning needs a reboot.
Welcome to the new Wild West.