The following video is part of our "Motley Fool Conversations" series, in which Motley Fool senior technology analyst Eric Bleeker and chief technology officer Jeremy Phillips discuss emerging trends in technology.

In today's edition, Jeremy and Eric look at the changing face of advertising. Previously, time spent on an advertising medium correlated strongly with advertising spend within that space. However, mobile advertising has yet to catch up with the trend. That affects not only companies such as Apple and Google, which have bought their own ad agencies, but also companies such as Pandora, which rely on advertising for their future.