check the stats for both time online & online spend -- I'm sure both are still growing; even in the US. then add in the # of young / old people on smart phones

check the stats for both time online & online spend -- I'm sure both are still growing; even in the US. then add in the # of young / old people on smart phones and tablets that weren't online 3-5 years ago, and you could say that even raw # users in US is also growing.