The shift to mobile has potential to be a major issue for any web service that currently relies on display advertising in the browser. Sooner or later these com

The shift to mobile has potential to be a major issue for any web service that currently relies on display advertising in the browser. Sooner or later these companies are going to need to find a way to monetize mobile app users. Third party mobile apps will also become an issue as consumers shift to mobile. For example Facebook, Twitter and Reddit all have very popular third party applications that bring in zero revenue for them. This is fine when the name of the game is all about increasing the number of users, but eventually they are going to need to increase the revenue per user.