From Nielsen:
It’s abundantly clear that Millennials approach digital content consumption differently from the rest of the population. More specifically, Millennials are an unfocused audience, not particularly loyal to just one digital music or communication service. But this doesn’t mean Millennials are consuming less content. This demographic is engaged with digital services during all waking hours of the day and while there are plenty of digital services from which to choose, Millennials are not choosing either/or, but many, and the opportunities are endless for how marketers and advertisers will capitalize on the plethora of their usage behaviors.
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See Also: Chart: Millennials Time Spent with Media (via Nielsen)