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Networks as Connectors and Disconnectors
We often talk about networks providing connection. The World Wide Web is a network that connects people with websites across the world. But interesting word "web", it is appropriated from a spider's "web", which has lots of strands that connect internally and to external supports, and enable the spider to move quickly over space. But the spider "web's" primary purpose is to tangle up the wayward insect that crosses its path and prevent it from traveling further. That meaning of the word comes from a further word describing woven fabrics, weaving, and tapestry. Weaving of clothes is of course aimed at preventing cold air from reaching the body and provides insulation.
We could look at the word "net", it is appropriated from a fisherman's net. "Open textile fabric tied or woven with a mesh for catching fish, birds, or wild animals alive; network; spider web," also figuratively, "moral or mental snare or trap." So it too has the connotation of restricting movement rather than facilitating it.
Ther term "grid" comes from griddle, a device for keeping things from falling into the fire (while spreading heat along its elements).
Building frames are types of networks to transmit force between the structure and the earth to provide support. But these supports are rigid and generally prevent going through them, requiring people to go around. Normally this isn't a big deal in a steel frame building, where the supports take a minimum of space, but in masonry or wood structures, the supports are pretty coterminous with walls, and individuals must find doors for passage. The walls and ceilings themselves, like woven clothing, protect the occupant from the vagaries of the environment.
Modern transport networks have much the same features as a spider's web. Roadways are designed to facilitate movement for cars while trapping pedestrians who want to cross the street. Cars don't literally eat pedestrians, but this environment certainly reduces the number of pedestrians, as people who would otherwise walk give up and join the motoring majority. We might say automobility eats walk mode share.
Wired power networks impose their own constraints. High voltage power lines are not to be touched, for instance. But they occupy little space. They do require the clearance of trees, disconnecting the dense bush in places, for the benefit of users of long-distance electricity. Power boxes often interrupt footpaths (needlessly).
Wired communications networks don't have the same voltages, but still have physical constraints. Boxes for communications need to be accessed, leading to works in the transport network.
The disconnection wrought by communications may be more intangible. For every minute someone is engaged with distant people online (or even colleagues two desks away), they are not engaged with anyone who may be directly in front of them. In person contact has dropped as online has risen. For those not online, their available world is shrinking. I don't know if this is a problem of the modern world, but it is a feature. Just as automobility enabled further suburbanisation and increasing distances between buildings, worsening the environment for those without a car, the always online world increases the effective physical distance between people, reducing the opportunities for those not on-board with the new technology.
We don't weep too many tears for those stuck on AOL or Friendster or Orkut or Myspace or Google Plus or the Blogosphere, in a few years this will be Facebook (I hope) and Twitter, and eventually Insta et al., as the Cool Cycle continues its relentless march. The cool kids can't be caught dead on the same network (wearing the same clothes) with the less cool kids (or their grandparents), and will migrate elsewhere. Being on different networks helps people differentiate their status, but that differentiation is a disconnection, slowing the flow of real ideas and information for the sake of social standing and relative positioning.
Once we have achieved communications saturation, for every increasing network online, producing network externalities for its members, it a world with a fixed time budget, some other physical or virtual social network is shrinking in either membership, attention, or both. Whether we have reached communications saturation is an empirical question, and perhaps brain to brain links will demonstrate how much further we have to go to create a truly social species, but it is feeling pretty saturated to me.