An Introduction to Community Detection in Multi-layered Social Network
  Social communities extraction and their dynamics are one of the most important problems in today's social network analysis. During last few years, many researchers have proposed their own methods for group discovery in social networks. However, almost none of them have noticed that modern social networks are much more complex than few years ago. Due to vast amount of different data about various user activities available in IT systems, it is possible to distinguish the new class of social networks called multi-layered social network. For that reason, the new approach to community detection in the multi-layered social network, which utilizes multi-layered edge clustering coefficient is proposed in the paper. 
Piotr Br\'odka, Tomasz Filipowski, Przemys{\l}aw Kazienko
cs.SI physics.soc-ph