The global media company ComScore has published a new report looking at media consumption habits and it is is well worth a read. It breaks down social media and youth / millennials differences to other age brackets and media types. Fresh data like this doesn't come about too often, so although it's US-specific it's good to see as a barometer.
All the trends you would expect are in there: Facebook's smaller audience with the youth demographic, Snapchat and Instagram's larger audience with that same group, and the growth of mobile. You can download the report in full here.