Welcome to the Social Connectedness Index (SCI)! Click 'S' to select a county. Click 'D' to toggle between the SCI and population density maps.

The Social Connectedness Index (SCI) is a measure of the relative probability that two places would have a Facebook connection, scaled to the population of the location. For example, if Williamson County had an SCI of 4,000 with Travis County, and Denton County had an SCI of 2,000, that would mean Travis County is two times more likely to have a Facebook connection in Williamson County compared to Denton County.