Labour HQ used Facebook ads to deceive Jeremy Corbyn during election campaign
This is disturbing for the following reasons:
1. It alerts us to the possibility of fake political adverts. Do I (hypothetically)see an ad purporting to be a Tory ad promising something that will damage me, placed by a non-Tory actor?
2. Are unknown actors placing adverts which cause discord and dislike?
3. How do we solve this problem? Where FB is not regulated it will be impossible to knowingly audit the materials on its platform. 
4. Given FB’s lobbying power, is regulation even possible?