Data quality can be evaluated with a knowledge of the processes underlying the production of
the data. Understanding users' interactions is a necessary step to find which areas are the most curated in OpenStreetMap. Extracting information from each user's contribution history it is possible to find the users' interaction network and their preferred area of activity. In this presentation we want to show how social network analysis over a given area can be performed to obtain a "collaboration score" for a single user and we present our work on the analysis of the OSM users' social network for Italy.