During the 2016 US Election, undecided voters were targeted and bombarded with negative Clinton (much of which was false) and pro trump political ads. Studies show that this played a significant role in DJT's victory, and that Russia had a hand in it.
If Facebook did not allow such deep personalized ad targeting then this strategy would not have been effective.
If Facebook did not allow such deep personalized ad targeting then this strategy would not have been effective.
Look into: Cambridge Analytica Scandal