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With the large-scale penetration of the internet, for the first time,humanity has become linked by a single, open, communications platform.Harnessing this fact, we report insights arising from a unified internetactivity and location dataset of an unparalleled scope and accuracy drawn fromover a trillion (1.5$\times 10^{12}$) observations of end-user internetconnections, with temporal resolution of just 15min over 2006-2012. We firstapply this dataset to the expansion of the internet itself over 1,647 urbanagglomerations globally. We find that unique IP per capita counts reachsaturation at approximately one IP per three people, and take, on average, 16.1years to achieve; eclipsing the estimated 100- and 60- year saturation timesfor steam-power and electrification respectively. Next, we use intra-diurnalinternet activity features to up-scale traditional over-night sleepobservations, producing the first global estimate of over-night sleep durationin 645 cities over 7 years. We find statistically significant variation betweencontinental, national and regional sleep durations including some evidence ofglobal sleep duration convergence. Finally, we estimate the relationshipbetween internet concentration and economic outcomes in 411 OECD regions andfind that the internet's expansion is associated with negative or positiveproductivity gains, depending strongly on sectoral considerations. To ourknowledge, our study is the first of its kind to use online/offline activity ofthe entire internet to infer social science insights, demonstrating theunparalleled potential of the internet as a social data-science platform.

The Internet as Quantitative Social Science Platform: Insights from a Trillion Observations