Marissa Mayer, Yahoo’s boss since July, says she is determined to make the company a stronger force on smartphones and tablets. Yahoo was born on the desktop, but unlike Apple, Google, Amazon and Facebook, points out Thomas Husson of Forrester, a research firm, it lacks a mobile platform, such as an operating system or social network, through which to provide its content. Yahoo, says Mr Husson, “will have to go through the various platforms to maximise reach”.