The deck's worked illustration, and worth quoting because the numbers are memorable.

Seasons 1 to 7 give a network of 400 nodes (characters) and 3,559 weighted edges, accounting for 41,578 interactions. Community detection finds six main communities.

They are Jon's alliance, Essos, King's Landing, Littlefinger's game, Arya's journey, and Houses Stark, Greyjoy and Tully. Each community has its own central characters, which is centrality computed within a community rather than across the whole graph.