The wheels are turning on my new book. “How Luther went viral” is an article I wrote for the Christmas issue of The Economist, extracted from one of the book’s early chapters, on the use of social media by Martin Luther. It was very heartening to see such a positive reaction to the piece on Facebook and Twitter, and I’m amused that people are still tweeting about it now, three months later. I also did a podcast to accompany the piece in which I examine the parallels with the Arab Spring, and the reaction of large companies to social-media criticism, in more detail. I took January off to work on the book, and I’ve now reached the 17th century, John Milton and Areopagitica. Writing about the Facebook of the Tudor court was fun. But I seem to be short of examples of ancient social media from Asia or the Arab world. Tipao? Dazibao? Any suggestions would be most welcome!