1 Clique percolation Clique percolation is a community detection method developed by Gergely Palla and his co-workers, see Palla, Gergely, Imre Derényi, Illés Farkas, and Tamás Vicsek. 2005. Uncovering the overlapping community structure of complex networks in nature and society. Nature 435(7043):814-8. Pubmed Arxiv. This algorithm is not implemented in igraph, but here is a quick (and rather inef