»Last week, Pew released the results of a survey investigating how users understand Facebook’s data collection practices and how they react when shown what the platform thinks it knows about them. The upshot is that 74% of users weren’t aware that Facebook assembles lists of their interests and traits. 88% of respondents were assigned “categories” for advertising, which could include racial or ethnic “affinities” and political leanings. 58% of those users were “not comfortable” with the company compiling that information.«
EFF: A Guided Tour of the Data Facebook Uses to Target Ads »