I write about the Internet technologies and upstarts that are disrupting advertising and media faster than ever. I'm living this disruption, so I might as well write about it, too. I spent nine years as chief of BusinessWeek's Silicon Valley bureau writing about the leading edge of technology and business, and I continue to do so for a variety of publications. Follow my posts here by clicking the "+ Follow" link under my name. You can also find me at my personal Web site RobHof.com, follow me on Twitter (robhof), Circle me on Google+, subscribe to me on Facebook, and email me (robert.hof@gmail.com).