ABSTRACT
You are about to catch public transport. As you get on board you notice a couple of seats ahead of you an acquaintance touching their smartphone rapidly; in fact, they are texting you now. As your phone vibrates you realize there are networks of very many different types all around. There are the communications systems, which your phone is a part of, allowing you to keep in touch – even though you are physically co-present in this case – through the touch screen. These same communication systems allow instant contact to distant and near social networks of families, friends and colleagues.
