Some might be interested in this paper:

A temporal geography of encounters
http://journals.openedition.org/cybergeo/28985?lang=en

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Drawing on recent explorations of social media locational data, we analyse the urban trajectories of people with different income levels in Rio de Janeiro in order to infer the space-time structure of potential encountersand assess social diversity on the streets.

best,

Vinicius M. Netto
Professor Associado | Associate Professor
Escola de Arquitetura e Urbanismo | School of Architecture and Urbanism | EAU 
Universidade Federal Fluminense | UFF