And Defense Secretary Robert Gates weighed in on the bits and pieces of information surfacing about Hasan.

CNN: STORY HIGHLIGHTS

My head was once filled with bits and pieces of information like phone numbers, to-do lists, and addresses.

FORBES: My Head is in the Cloud

In another talk at Black Hat, researchers Don Bailey and Nick Depetrillo showed how they were able to take bits and pieces of mobile information (such as the IMSI), Caller Display Name (CNAM) and the Home Location Register (HLR) to put together a mobile White Pages that would allow them to stalk someone.

FORBES: Cell Phone Snooping: Cheaper And Easier Than Ever