As I write this, about 4.7 million Americans have clicked the “I voted” button on Facebook. As best I can tell, there are between 125 and 150 million Facebook accounts in the US, and about 90% of these belong to people of voting age. Of course, lots of people have Facebook accounts but don’t use them. Facebook says half of registered users log in every day. So let’s say there’s a pool of about 60 million people who might be expected, if they voted, to click the Facebook button. Turnout in the election is expected to be about 50% — though of course it will be lower among 18-24s, who are disproportionately represented on Facebook. How many voters will Facebook tally by the end of polling?
Of my friends, 13% have voted.