Well, as I've read on this, there is good news and bad news. The good news is that the best predictors of how you're going to vote are already public. Wait, may

Well, as I've read on this, there is good news and bad news. The good news is that the best predictors of how you're going to vote are already public. Wait, maybe that's the bad news. Either way, as you say one can already do very granular advertising through FB already, but having more data is not necessarily equivalent to having better information, and you're not necessarily trying to market optimally to every potentially identifiable segment. If you knew that peanut-related political ads played really well with left-handed leftist lecturers in LA, you might still not consider that worth taking action on. For most people things like age, income, education, party registration, and parent's party registration are sufficiently predictive.