Just to hammer home the trend, Nielsen published its Tops of 2013: Digital charts yesterday, ranking the top web, video and app brands for the year in the US. Google tops the web list with an average monthly unique audience of 164.8m Americans, with YouTube topping the online video chart with 128.4m, and Facebook the smartphone app chart with an average of 103.4m monthly uniques. But the trend from desktop to mobile is clear: every single one of the top 10 US web brands fell year-on-year, from 1% for eighth-placed Amazon to 16% for second-placed Facebook. Meanwhile, each of the top 10 smartphone apps saw double-digit growth in the same period, from 14% for Google Maps to 66% for Instagram. One surprise, though: no Pandora in the top smartphone apps chart, implying it has less monthly unique viewers than tenth-placed Twitter’s 30.8m. Yet with 72.4m active listeners in November and up to 80% of its listening happening on mobile and connected devices, we’re baffled as to why Pandora isn’t on the chart.