"5th week's Summary and Comment"

**Summary**
Before starting summary, let's know also five key points learning in lecture so far.

1. When technologies connect or separate people, they become media.
2. Technologies embody social, political, cultural, economic and philosophical ideas
and relationships.
3. When a medium is new, it is often used to simulate old media.
4. New media do not replace old media, they displace them.
5. People make media and then media make people.

Social Network

Today's key points are two.
One key point is that "New media technologies usually reinforce existing social networks or even work to isolate people." Its mean is what we can't see each other but messenger or nate on etc. are inducing meeting in reality each other. BUT, if the technology is reinforced, we can be isolate. That is, this is look like number 5 among up five key points.

Another key point is that "(BUT) When new media technologies facilitate new social networks, they simultaneously challenge existing social, political and economic relationships." Social networks are connecting things with relationship each other. It can be personal relationships or learning relationships.

①⁍ Social networks as science : field
'social network analysis is an interdisciplinary social science, but has been of especial concern to sociologists;' → In general study.
⁍ Social network as science : definition
'[Relationships] provide individuals with opportunities and, at the same time, potential constraints on their behavior.' → Some sentence are seeing definition.
⁍ Social network as science : history
'Let's a genealogical chart. There, centrality can not find because history is what accumulated.' → weak relationship > strong relationship (ex. same educated people.)
⁍ Social networks as science : equivalence
'A and B are "structurally equivalent" because they connect to the same people and thus have equivalent positions in the network.' → Let's PPT picture.
⁍ Social networks as science : centrality
'centrality and the external' → society leader is not need but society centrality is need!!
⁍ Social networks as science : bridges
'with connecting each other'
⁍ Social networks as science : social capital
'if you connect separate networks you have bridging capital, if you are central
to a network you have bonding capital'
⁍ Social networks as science : bowling alone
'sociologist robert putnam claims that united states citizens no longer know or trust their neighbors and thus communities have lost their social capital'→ Let's recall today's key points.

② Social networks as technolohy
email, newsgroups, and weblogs etc.
-A webpage is considered popular if many other webpages link to it.

③ Social networks as popular culture
'their identity and connect in personally meaningful ways' → very important

④ Social networks as art
'It express relationship each other as art.'

**Comment**
This week lecture is a little simple so I undestood not difficulty.
I learned many information about "Social Network".
Next time, let's learn artificial intelligence.