Large-scale biological networks such as gene regulatory [1] and PPI [2] have become commonplace through systems biology. Figure 1 shows a microbial social network [3], which attempts to infer interactions between microbes within a community from metagenomics studies. In particular this is a co-occurence network [4], where green/red edges respectively represent positive/negative correlations, or how strongly two bacterial taxa tend to co-infect samples.