KEY POINTS
Snapchat and Facebook logos pictured on smartphones

Half of all global advertising dollars will be spent online by 2020, matching the worldwide combined "offline" ad spend, such as TV, print ads and billboard posters, according to forecasts.

Media agency Magna forecasts that digital media will take 44 percent, or $237 billion, of all ad money spent globally in 2018, with that figure reaching 50 percent, or $291 billion, by 2020.