Figure 1. Maximum k-core subgraphs show clusters of significant vaccine concepts within the semantic networks.
Visualizations of maximum k-cores (i.e., the maximal connected subgraph in which all nodes have degree of at least k) for networks of [a.] positive vaccine sentiment (k = 4), [b.] negative vaccine sentiment (k = 4), and [c.] neutral vaccine sentiment (k = 2) where increasing node and text size represents increasing betweenness centrality.