I mentioned this in another thread and got immediately downvoted, which I predicted would happen. I will add more context here to perhaps avoid that. What I said was:
"What changed is that an attack vector has been found to take out Cambridge Analytica. The Democrats are in full political warfare with the Trump regime, and this is just another salvo."
To be clear, I am not a Trump supporter, and identify as a far-left progressive, so I'm only stating what I see to be happening, and not attacking the Democrats. Secondly, I used to work at a gaming company that was the largest 3rd party integration with Facebook, and saw that this type of data leakage has been the norm and not the exception for at least 8 years.
Trump has been under a (mostly deserved) multi-pronged attack by various left-wing media, political, corporate, and voter organizations since he got into office. What is happening is that many, if not most, upwellings of public sentiment against his presidency are actually engineered through the very same sorts of PR firms as Cambridge Analytical, even though most people think the that it's organic. There is obviously organic disgust for Trump, but it's being fed and amplified and warped and guided using the same social media techniques that Cambridge Analytica uses, which is ironic.