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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 internet pages in which someone can acess, create an personal account with this they contact old friends that they havent seen them for many years and also make new friends. The most big and important social network is my space because in this social network people can access create their own web page and upload music, this social network also have been the source of publicity that all peaople could use to show their work or even some explicit images (as it is most commonly now a days). Now a days the most famous social networks are facebook that was created for harvard students but it expands all around the world, the another social network is hi5 and Twitter, here famous persons add their own coments and chat with their fans.A social network may also be the wikis as they can be open to the public, but some web pages of this category may have some restrictions as in blogs.

Some inventions that google made were: the competition of the cell phone agains Mac(iphone), the "google" web page, the browser "google chrome", the "g-mail"(an e-mail account that is upgraded each year), the android operative system.

First the optical devices were big CD's that only save files, then it countinue to change and now the CD's were able to storage music, after that the mini CD's appeard letting space to the DVD (that first was just for video then was also for audio), and finally the blue-ray.

The pixars history started when Steve Jobs bought "Lucas Films.Ltd" by paying $10,000,000, the company started to grow slowly by just making some comertials the first comertial that pixa do was for the Tropicana, then Pixar goes to California and start doing comertial for trident and many other famous companies; in 1997 Pixar and Disney get together to create toy story; this movie was the fist animated movie from Pixar this movie wons many awards from the academy this make ´Pixar to create the second part of the movie Toy Story 2 this movie wons even more awards than the first one, Pixar makes the movie Bugs Adventure tha also gave them a lot of awards.til 2007 when Disney bought Pixar for 7.8 bllion dollars.In 2008 Pixar makes the movie Wall- E that have a very huge impact on the animation movie industry the final movie of Pixar is UP, now adays Pixar main competition is Dreamworks which is also one of the greatest animation industries on the market.