Sharing mobility economy and social capital

Our research concerns the car pooling service BlaBlaCar and the development of social and relational capital resulting from the usage of this platform. The investigation is based particularly on the 2016 paper by Arcidiacono and Pais, which proves that most of BlaBlaCar users develop social relations with each other. Analyzing the methodology of the Arcidiacono and Pais paper we found out that they delivered the survey just to "heavy users" of BlaBlaCar (= people that used the service at least 5 times in a period of 4 months).This is the starting point of our main research question: is the social relation development following the use of BlaBlaCar ordinary? Or does it just concern the heavy users of the service? If not, is the usage of BlaBlaCar correlated with other main reasons (above all, money saving)?