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ABSTRACTThe snowball sampling method (SSM) is one of the most widely used methods to collect information about hard-to-reach populations and in low-information contexts. This article argues that SSM can be enhanced by the use of Facebook in at least three ways. This social-networking site helps to address some of the inherent limitations of SSM by learning about local contexts and identifying principal political actors, by gathering background information about and establishing contact with them, and by triangulating information they provide and reaching out to additional key informants. Thus, this article shows how Facebook can provide leverage in overcoming the problem of biased samples and offers concrete empirical illustrations from research on local politics in Latin American countries.

The goal of this article is to contribute to a burgeoning comparative literature about nationalization of party competition (political parties and party systems), clarifying its terminology and evaluating three different indices of measurement of this phenomenon and used recently in Latin America. This paper argues that despite the confusion in the terminology, the term nationalization should be understood as homogeneity of electoral support across the territory and that a proper measure of nationalization should take into account four basic elements: party presence across the country, number of subnational units where it is measured, its magnitude and the size of the party. The revision of the literature dedicated to Latin American countries reveals that more case studies of long-term evolution of party systems and explanation of its changes and party-centred variables are necessary. Adapted from the source document.