Thanks to a partnership with advertising giant Clear Channel Outdoor, the G-men will deploy some 150 digital billboards -- capable of displaying fugitives, missing children, or public safety info in real-time -- to 20 major cities around the country, following a successful trial launched in Philadelphia in September.

ENGADGET: FBI rolling out digital billboards in 20 cities

But in the case of Brazil, the removal of outdoor advertising may well have helped catalyze brands and the Brazilian ad industry to make a giant leap into digital.

FORBES: No Billboards, No Outdoor Advertising? What Next?