Digital Out-of-Home (DOOH) refers to digital displays and networks located outside of the home in public spaces. DOOH includes digital signage, billboards, and other networks used for advertising. The DOOH industry is growing and expected to reach over $10 billion globally by 2012. More local and user input is predicted to be incorporated into DOOH content and networks in the next two years, resembling trends in user-generated content online. Mobile displays and smaller, lower-cost digital screens are also expected to expand the DOOH industry into new locations and applications.