According to the Social Brain Hypothesis (S.B. H.), social networks are a specific level of
analysis of social behavior in which the individual on spot has a set of social contacts, with
whom he/she interacts regularly and consistently, and with whom he/she exchanges
personal information. Although, H.C.S. and other theoretical perspectives are engaged to
investigate a similar set of variables on social networks, this similarity did not lead to a
consensus on the definition of this term. Given this theoretical and methodological
diversity, we conducted three studies in order to elucidate this phenomenon, since the
available instruments can so far not be accurate enough to define it accurately. Thus, we
discuss and propose that these variables can be understood as three types of interpersonal
factors (factors of the Ego, the Alter, and Context). The presence/ absence of each of these
categories produces a unique setting in social networks, which, however, it seems to have a
common bias on the peculiar way humans to bond and establish interpersonal
relationships. This underlying nature is considered human psychology, or the "Ego", an
unconscious agent who actively choose their social contacts and decide how to invest
his/her time and bonding. This "Ego" has a neural basis, particularly the neocortex, whose
volume is correlated with the size of human and non-human social groups. We also
examined how the "Ego" shows a distinct preference for maternal relatives over other types
of relatives. This preference changes according to individuals’ lifespan, but on the other
hand was less sensitive to cultural aspects. Finally, we found that the higher/lower
frequency of relatives and friends in social networks depends on the order in which thexii
section of each social group is presented in the questionnaires. Furthermore, the listing
order in which participants described their social contacts depended on the emotional
closeness to each social contact. We concluded that methodological decisions can affect
the way we define the networks size and composition, and therefore, improvements are
required to define the concept of social networks more accurately. The set of results was
interpreted according to the S.B.H. and the Evolutionary Psychology, which both
understand this psychological agent as a product of evolution, which interacts with the
current environment, the features that were selected in the evolutionary past of our species.
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