Characterizing ad targeting practices, user perceptions, and ad explanations through users’ own Twitter data. What does Twitter know about you…and how do you feel about that? If you are anything like me, targeted online advertising may feel a bit like that famous quote from Mickey Mantle: “It’s unbelievable how much…

When browsing the Internet, who do you trust more: facebook.com or state.gov? A knee-jerk reaction might be to pick state.gov — given Zuckerberg’s consistency in drumming up uncannily accurate advertisements and state.gov’s seemingly innocuous purpose. Or you may feel like this is simply a “choice of evils” and, when backed…