Social networks are made up of different types of social interactions. This multi-relational aspect is usually neglected in the analysis of large social networks. A monochrome representation, such as provided by mobile phone data (see figure 1), leads to a gross representation of the system. The richness of the interactions can only be uncovered by identifying the nature of the links between people (represented by the different colours in figure 2). Because players are immersed in a virtual world in online games, all their actions/communications are stored in log files, resulting in rich data.
A new study analysing interactions between players in a virtual universe game has for the first time provided large-scale evidence to prove an 80 year old psychological theory called Structural Balance Theory. The research, published today in PNAS, shows that individuals tend to avoid stress-causing relationships when they develop a society, resulting in more stable social networks.