> They don't explicitly provide data Because first and foremost, FB doesn't have explicit health data. > If there's a correlation between likes and health con

> They don't explicitly provide data Because first and foremost, FB doesn't have explicit health data. > If there's a correlation between likes and health concerns that allows for statistical inferences about users health, that's a security flaw. Then any information is a security flaw. Just being male/female or age alone allows for significant inferences about users' health. Not many 18 year old women are gonna click on those prostate exam ads. Similarly, those interested in body building probably won't be interested in "fat burning" pills, and those following transgender-themed pages are gonna be more interested in HRT ads.