Figure 3

Two-dimensional PCA projections of BLOC TF-IDF vectors of accounts from six datasets that include both humans and bots (see Table 2): (A) cresci-17, (B) botometer-feedback-19, (C) cresci-rtbust-19, (D) cresci-stock-18, (E) varol-17, and (F) gilani-17. From each of these datasets, we select an equal number of bot (orange) and human (blue) accounts. We use all the accounts in the minority class, and sample an equal number of accounts from the majority class. The Venn diagrams show the top five pause-delimited BLOC words for the bot and human accounts shown