For his latest What If? column, Randall Munroe tackles the question “When, if ever, will Facebook contain more profiles of dead people than of living ones?”

Based on the site’s growth rate, and the age breakdown of their users over time, there are probably 10 to 20 million people who created Facebook profiles who have since died.

That’s an incredible number; most tech startups would kill (well, not really but maybe…) for that many alive users.