And the third is the geo-targeted and content-targeted advertising that YouTube has developed specifically for mobile devices.

CNN: Will mobile kill digital advertising?

Many observers think Apple has plans to offer geo-targeted advertising on its iPhone.

ECONOMIST: Location-based services on mobile phones

Marketing materials and a 20ft ad-trailer were situated across the east of Scotland and Facebook adverts, that were geo-targeted to people living in the area, ran throughout the six-week operation.

BBC: Cash and assets seized from proceeds of crime