Email has long been overridden by social networks, and these are now being relegated to the sidelines by messaging, the new boom of the Internet. This kind of service has now displaced conventional text messages. Facebook sees it and is pushing ahead in China. And a 48 hour ban on Whatsapp caused rival Telegram to soar in Brazil. Mercury was the Roman god of messages and commerce. And like him, fads in the Internet move quickly and are fickle, like mercury, the element.