Big Data is all the rage in Silicon Valley. From Facebook to Netflix, companies are tracking and analyzing our searches, our purchases, and just about every other online activity that will give them more insight into who we are and what we want. And though they use the massive sets of data they collect to help create a better experience for their consumers (such as customized ads or tailored movie recommendations), their primary goal is to use what they learn to maximize profits. But can Big Data also create positive social change?