The ability to be on a call, ask for information about a restaurant (from google), and share that location with your caller is about merging information you need and tasks with your nexus of contacts.

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Internet phone systems route calls to a particular address on the internet, not to a specific physical location, so it can be tough to provide emergency services with information about where a caller is located.

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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