Mayor Jose Antonio Rodriguez Salas checks his smartphone at his office in Jun, Spain. Salas claims he has shaved an average of 13 per cent off the town’s budget every year since 2011, thanks to the extensive use of Twitter, and created a digital democracy where residents interact online almost daily with town officials. Photograph: Laura Leon/The New York Times

When José Antonio Rodríguez Salas’s daughter Martina was born in April, he turned to social media to share the news. However Rodríguez Salas, the may(...)