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We study the structure of a social network of strong ties (trust network)investigating its property of connectedness versus fragmentation. To thispurpose we analyse an extensive set of census data, about marrying or havingchildren with immigrants, collected by Italian national statistical institutefor all Italian municipalities from 2001 to 2011. Not using neither obtainingpersonal local information but only average ones, our method fully complieswith privacy and confidentiality. Our findings show that large cities displaythe behaviour of highly fragmented trust networks where individuals facepossible phenomena of alienation. Smaller cities and villages instead behavelike fully connected social systems with a rich tie structure, where isolationis rare or completely absent. While confirming classical sociological theorieson alienation in large urban areas our approach provides a quantitative methodto test them and a predictive tool for policy makers.

Alienation in Italian cities. Social network fragmentation from collective data