If you work for IBM, you can bring your iPhone to work, but forget about using the phone's voice-activated digital assistant. Siri isn't welcome on Big Blue's networks.

The reason? Siri ships everything you say to her to a big data center in Maiden, North Carolina. And the story of what really happens to all of your Siri-launched searches, e-mail messages and inappropriate jokes is a bit of a black box.

IBM CIO Jeanette Horan told MIT's Technology Review this week that her company has banned Siri outright because, according to the magazine, "The company worries that the spoken queries might be stored somewhere."