Both examined networks are sparse: The density of respondent-non-respondent network is 0.0023; and the density of respondents’ network is 0.0036. As consequence, it is not surprising that of the organizations mentioned in the survey, nearly quarter (24.5%, N = 144) have zero indegree. Most of them (N = 139), though filled up the questionnaire, were not indicated by anyone as collaborators. Figure 1 displays degree distributions for 587 and 221 networks. Note that the 221 network is almost half composed of isolates (N = 108) with respect to outdegree, that is of those NGOs which participated in the survey, but either did not mentioned any partner or friend, or their partners and friends were non-respondents.