Who owns the [North American] Internet?
This is a nice example of the cohesiveness principle of trends/ services/ products diffusion, mixed in with technological infrastructure constraints. AT&T and Verizon are the leaders at the minute, but there are distinct bubbles of resistance which - according to Latane's DSIT - exist because of consolidation, clustering, continuing diversity and correlation. In other words, the minority resistance (i.e., dots of colour that lie within the AT&T and Verizon sea) exists because the people who use alternative services have bandied together (unconsciously) and are protected by the illusion that they, and others around them, are in fact the majority.
Social Network Analysts would call it slightly differently, depending upon the approach.
A good case study.
via Valdis Krebs on the SOCNet listserv.