Today is Election Day in the United States, and along with the many efforts by campaigns and advocacy groups to get out their voters, Facebook is taking a big step to push people to the polls. As I reported last week for Mother Jones, for the first time in six years, Facebook says it is rolling out its "voter megaphone"--a banner across the top of each user's page like the one shown above--to all of its users above the age of 18 in the United States. That's somewhere upwards of 150 million people, if all goes according to plan. While other tech giants, notably Google and Microsoft, have put resources into making it easier for people to find their polling...