The PageRank algorithm  used by Google Search to rank websites in their search engine results is used here as a first approach for the development of a trust measurement algorithm that provides a value to each pair of users. This algorithm is used here to predict whether two people can trust each other. However, since it does not fully fit the morphology of the specific problem, a second approach is also used here to complement it, based on Bayesian networks to know whether people can trust each other. The refined algorithm for trust measurement contained in the developed Android application is explained below.