The document discusses mobile technologies for promoting cities, including mobile apps, mobile web, and social mobile apps. It notes that over 90% of city guests now use smartphones and that augmented reality and social apps can provide an engaging user experience. Examples highlighted include apps that overlay historical facts onto street views and apps like Foursquare that allow users to share reviews of places. The document argues that cities should ensure their information and services are accessible via mobile to remain visible and attract visitors.