that's doesn't mean it's because that amount of twitter users are fake tho
I'd argue real people rarely click ads
for facebook I read that most of the advertising money is spent on clickfarms, which just click anything to seem real e.g. follow 100 real brands and sell 50 fake follows on that acc.
It's weird how the hard working people that don't like their job get paid close to nothing and the software people enjoying their jobs get rich. I'm lucky that I could turn my hobby into a well paying profession, but it's kinda weird...