This Adweek article suggests that election ad-spending could be headed from TV stations to social media because more millennials get their political news from Facebook instead of television.
There's just one problem with that cause-and-effect scenario, however. According to
this 2014 piece in the Guardian, millennials are big consumers of free ad-blocking browser extensions: 41 percent of them block Internet ads.
Interesting to see that
German courts have been siding with consumers.