Figure 9
The symmetrized retweet networks for the Twitter discussions (a) Valentine and (b) Snapp. In the upper triangle the rows and columns are reordered such to group nodes by their retweet communities. In the lower triangle, the reordering groups nodes by the community they belong to in the corresponding friendship network. Excluding the isolated nodes, the retweet network of the Snapp discussion has 21029 nodes and 69565 edges, and the retweet network of the Valentine discussion has 3705 nodes and 4491 edges.
