Core-periphery analysis for the Occupy and Indignados networks.

<p>Panels A and E visualize the connections across <i>k</i>-cores (arcs with lower strength have been filtered to improve visualization). Unlike the Turkish case, these protests did not have a clear epicenter, so nodes are colored in proportion to the number of retweets received (i.e. normalized instrength). Core-periphery dynamics are, however, similar to the Turkish case: most of the information flows from the core to the periphery, where users are significantly less active on a per capita basis but who, on the aggregate, contribute a similar volume of messages. Panels D and H show that removing the three outer <i>k</i>-cores results in a drop of audience of about 50%. The random benchmark is, again, based on 10,000 permutations of the data and it can be interpreted as a line of perfect equality.