Barabasi - The Third Link

1. What is the principle of six degrees of separation? What number of social links does any one person need to be connected to global society? p. 30
The principle of six degrees of separation is that two people in anywhere in the world are linked by only six social links. It means that a parson is connected to any other person mediating about five people.

2. How is the fabric of society today different from pre-internet society? p. 31
The fabric of society today is different from pre-internet society because the collection of individual documents are linked in a huge web network. People have became able to access to other people's document easily and quickly with the internet.

3. How many more links separate any pair of web pages compared to people in society? What can explain the difference? p. 34
Any pair of web pages is "nineteen degrees of separation" and people's one is "six degrees of separation," so web pages' link has thirteen more links than people's one.
The biggest difference between web's society and people's society is that to find every links on the network is easier in the web's society than people's society because to find every links between one person and the others is almost impossible.

4. So far, what ranges of separation have network scientists discovered in different kinds of networks? p. 34
The network scientists discovered that every networks which were examined display separation between two and fourteen. For example, "species in food webs appear to be on average two links away from each other; molecules in the cell are separated on average by three chemical reactions; scientists in different fields of science are separated by four to six coauthorship links; and the neurons in the brain of the C. elegans worm are separated by fourteen synapses." Therefore, the web's nineteen degrees of separation is the largest record.

5. What does research suggest about the fundamentals of networks? p.34-35
The logarithm can make the huge network to the small world. (I am not good at math so I could not understand why logarithm can do such a thing.)

6. What is your estimate of your personal number of connections to society? What connections are your strongest?
I cannot believe that I am connected to every person in the world mediating 5 or 6 people.
I have no idea about my strongest connections.