Facebook Wants You to Vote on Tuesday. Here's How It Messed With Your Feed in 2012.

This is the age of big data and powerful algorithms that can sort people and manipulate them in many hidden ways. Using those tools, national political campaigns, building on the Obama 2012 reelection effort, are learning how to "engineer the public" without the public's knowledge, as sociologist Zeynep Tufekci has warned. Consequently, there is a strong case for greater Facebook transparency when it comes to its political efforts and experiments.