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4. What are Social networks and give some examples that were presented in the class? Type at least 6 examples of inventions from Google. In some words tell what is the history of the optical storage devices. In some words explain briefly Pixars' history.

Social networks are webpages that connect people with others, let them to socialize or be in contact when they have to take with many people at the time (thing that you can´t do with a phone or with maximum of 3 persons). In them, people have accounts where they can upload photographs, music, videos and their information, without saying that this things also can be shared between your friends. Social networks help people reconect with people they haven't seen in a lot of time, help with work (companies, employees) and even help artists with music. Social networks are a very way of communication. But we have to mention that not always affect the society in a good way, they are also creation problems such as: murders, suicides (because of the comments that people make in other person profile), kidnapping or the iran problem.

six dregrees was the first social network to be created facebook myspace twitter hi5 (this ones had the more impact in society)

Google Inventions: 1. Google Mail (Gmail): - a free mail that revolutioned e-mail 2. Google Docs - a free space in the web where you can create documents in word processor, spreadshits or calculating pages and save them in the web 3. Google Earth - an application in which you can see the world and it is based in satelite images 4. Google Chrome and Google Chrome OS . Google's web browser that is also the base for an OS in which you can use the web as a hardware 5. Nexus One - Google competition against Apple iPhone. Mobile phone 6. Android OS, operative System for cellphones as the T-mobile G1 - An OS for cellphones developed by Google 7. Google Moon - the result of the coontract between NASA & Google to develop a software similar to Google Earth but on the moon 8. Google Mars - the result of the coontract between NASA & Google to develop a software similar to Google Earth but on mars 9. Google Search Engine . the first Google invention 10. PageRanking -developed by Larry Page that ranked the pages in Google Search Engine 11. Google Adwords/Adsense - Google adverts

Optical storage devices: The optical devices were invented by David Paul Gregg, they were removable media that can be read in drives. The first generation was the laser disc wich only could storage data, the secon generation was the CD and the mini- disc that were more capable to storage information and data. In the third generation it appearred the blue-ray disc that uss the most technological quality and they are the new optical storage devices which also can contain video.

Pixar: Pixar was the part of Lucasfilm that Steve Jobs bought when he wasn't in Apple. He bought it in $100,000 and gain a much bigger income. It started by making adverts for tv and ended making blockbuster movies. Steve Jobs sold Pixar for a lot more money than he had paid for it. Nowadays, pixar uses 3D animation. Its first major film was toy story, which won awards.