That is an interesting problem solution question. Here are some other possible questions on the same topic:
What is the impact of digital advertising in developing countries?
How can small businesses use digital advertising effectively?
What types of digital advertising are most successful in developing countries?
Can digital advertising be used to solve social problems in developing countries? I know some studies are being done about this last topic, and there is the wonderful example of the "Dumb Ways to Die" campaign which reached worldwide notoriety by using a catchy tune to urge people not to do things that would cause them to be hit by a train.