Abstract
We introduce and study a general model of social network formation and evolution based on the concept of preferential link formation between similar nodes and increased similarity between connected nodes. The model is studied numerically and analytically for three defi nitions of similarity. In common with real-world social networks, we find coexistence of high and low connecti vity phases and history dependence. We suggest that the positive feedback between linking and similarity which is responsible for the model’s behaviour is also an important mechanism in real social networks. PACS numbers:
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