A cross-institutional project producing estimates of international migration flows, derived from anonymized, aggregated platform data. The work powers a public dataset on the Humanitarian Data Exchange and an interactive visualization at The New York Times.
Data: Data on HDX
Research: PNAS 2025
Media Coverage: New York Times · NYT interactive tool
The Social Capital Atlas is a public dataset and interactive tool measuring three forms of social capital — economic connectedness, social cohesion, and civic engagement — across nearly every U.S. ZIP code, high school, and college. The underlying research showed that economic connectedness is one of the strongest community-level predictors of upward mobility in the United States.
Data: Social Capital Atlas
Research: Nature I · Nature II
Media Coverage: The New York Times · The Economist
The Social Connectedness Index (SCI) measures the relative probability of friendship between people in different locations. The dataset has been used by researchers across economics, political science, public health, and sociology to study migration, trade, the spread of COVID-19, knowledge diffusion, and inequality.
Data: Social Connectedness Index data
Map: Interactive explorer — countries, EU regions (NUTS-2), US states
Research: JPE 2018 · RES 2019 · JEP 2018
Media Coverage: New York Times · The Economist · Bloomberg
The UK Social Capital Atlas maps social capital across the United Kingdom — including economic connectedness, the extent to which lower- and higher-income people are friends — built from the friendship networks of roughly 20 million UK adults (around six billion friendships) on Facebook. It is the UK counterpart to the US Social Capital Atlas, produced with the Behavioural Insights Team and partners including Meta, the RSA, the Neighbourly Lab, Opportunity Insights, and Stripe Partners, with funding from the Nuffield Foundation.
The work documents that children from lower-income families who grow up in more economically connected UK communities go on to earn substantially more as adults, and that shared activities and the built environment — not just geographic proximity — shape who becomes friends.
Data: UK Social Capital Atlas on HDX
Research: SocArXiv working paper · Behavioural Insights Team report
Social Capital Lab