What they do have is a giant corpus of behavioral data spanning everyone on the planet. Companies can (statistically) detect that you are going to get a divorce, or that you are going to be pregnant. They know everyone who has been to jail, our sexual fantasies, how likely it is that our children will go to college.
Right now we say they sell ads, but you could just as correctly say that they take advantage of this incredible, unprecedented information advantage to directly change the world in their favor and in the favor of whoever can pay. It used to be used to sell clothing and frippery, but already SM is plastered with ads for political campaigns and brain-altering drugs. Their cultural hegemony will only increase over time, as the data gets better and the methods become more effective.
In this regime, what does it even mean for Facebook to “leak my data”? If anything I’d rather it was out in the open. (Although I’d much rather it didn’t exist!)