Seventy percent of the country uses Facebook each month—50 percent of Americans under 35 check it first thing every morning. By 2015, people will have tweeted more words than in every book ever printed. A third of all marriages in the United States now begin online—meaning one in three children in the class of 2032 will have been facilitated by an algorithm. Social media has become essential to the fabric of our society. We know that companies and the government are using our data, sometimes in ways we’re uncomfortable with.