As you decide to share a certain amount of information with your friends that doesn't make it a free-for-all for the world. It is understandable, I think, for an individual using Facebook who expresses an interest in red cars might get an advertisement about red cars. What would certainly be beyond the expectation of an individual is that they would be psychologically profiled and identified as a candidate for a particular ad because they were open or neurotic or whatever the classification is. I think that goes well beyond what the expectation of an average citizen would be, and that does fall afoul of privacy law.
On May 10th, 2018. See this statement in context.