Network theory – Marc Samet
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Network theory – Marc Samet


Translator: Andrea McDonough
Reviewer: Bedirhan Cinar What does “going viral” on the internet really mean, and why does it happen so quickly? Why is a financial institution too big to fail? How does a virus in Africa end up in the United States in a matter of hours? Why are Facebook and Google such powerful companies at creating global connections? Well, in a word: networks. But what are networks? Everyone knows about their social network, but there are all different kinds of networks you probably haven’t thought about. Networks are collections of links which combine by specific rules and behaviors if they are alive. We say that networks are alive because they are in constant change. Over time, the connections within a network migrate and concentrate in new places, forming evolving structures. How the evolution and concentration of constantly changing connections occurs is the subject of a whole discipline called network theory. We can think of networks as neighborhoods. Neighborhoods are defined by maps. A Google map demonstrates the relationship between locations in exactly the same fashion a network connects hubs and nodes, using streets as links to connect neighborhoods. The reason a network can expand and evolve so quickly is based upon a mathematical concept called power functions. A power function is a mathematical amplification mechanism, which over specific and very small ranges, accelerates changes logarithmically. That is, a very small change in one parameter produces a huge change in another over a very specific range of values. An example of how network structure emerges is the algorithm used by Google. As the number of links around a search term, say “friends”, increases, connections begin to form among millions of different searches using the term “friend”. What Google has cleverly accomplished is a real-time mathematical model for how to predict the emergence of growing connections among billions of search terms. The algorithm Google derived collects the number of references to any search object. As references to a search object increase, the number of links also increases, creating a node. As the node increases in size, it eventually becomes a hub, which links to many nodes. Networks will continue to emerge as new ways of connecting and creating neighborhoods are defined. Perhaps you can begin to see why networks are so powerful. As Google continues to collect the billions of daily searches, new clusters of links will rapidly emerge, forming additional and growing networks. Despite the logarithmic expansion of your network, the laws of six degrees of separation still apply. Therefore, if you explore a close friend or acquaintances in you Facebook network, everyone on average will be separated by six individuals or less and a map of your social network will create neighborhoods linked by common connections among friends.

81 thoughts on “Network theory – Marc Samet

  1. The only part where Marc mentions it is at the beginning… 'it only takes a matter of hours for a virus to get from Africa to US…'

  2. how does one catch facebook? and only dumb people get the flu? I think you should take a class in biology my friend

  3. Network theory? Laughable! Study signal theory and system theory – both well established over decades. What's up with weak minds, trying to cash in on the most banal ideas every 4 year old could figure out? Writing a book? Giving talks? With THIS??

  4. This video is a vast oversimplification of what network theory is. I'm amazed that you'd jump to any conclusion about it based on this.

  5. I cannot quite put my finger on it but this video really fails to capture the topic. I wouldn't use this video even to just introduce the idea because I think it plants the seeds of misconceptions that I'd have to fix up.

  6. Entendí casi todo, pero si alguien pudiese subtitularlo al español, Este material seria un gran apoyo didáctico en clases de computo y variaciones 🙂

  7. Exponential functions are also essential tools in understanding climate change, peak oil, the Limits of Growth.

  8. It's because it was explained in an incredibly confusing manner, or maybe because of that plus the fact that we all pretty much already knew what they were saying and it overcomplicated it so much that we think there's something we missed, when intact we already know everything in the video.

  9. After reading the two top comments and thinking about the TEDEducation, I must conclude that these short films are kinda bullshit. They don't make things clear and the educators seem to make them simply for the sake of making them. Thumbs down, sadly…

  10. we should understand that networks are complicated and that actually we don't know how it works, it just keeping growing up.

  11. Short and ineffective. Too vague, but artistically well thought out. This is from the perspective who has little to no understanding of the Network Theory.

  12. I did not understand the concept…Ted Ed videos are really awesome,and I love almost all of them,so I thought mayb only I did not understand what he had explained….but as I checked the comment section,it turn out,many did not understand it as well…..

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