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4. What are Social networks and give some examples that were presented in the class? Write all the information you know about the Digital Music presentation.

Social networks started in the 1990's with the idea of creating a program that would help the communication in an office, the program had the initials of BBS that meant Bulletin Board System.

In 2002 what gave the boom to the social networks was a program called Friendster. Social networks, can grow very fast because they way in which they work. Social networks help to share information, photos, videos, status and they have many applications in which you can play or for other things. Some examples of social networks are: Facebook My space Hi5 Twitter

Social networks are popular in our every day life because you can see what others do or share photos, comments, etc

Digital Music

The MP3 is a way of compressing music into a smaller file, therefore the MP3 gives you some advantages, it keeps a good quality of sound and you can save more music into files like this without using a lot of memory, so in fact it was a invention that helped sharing and having music, it also make it easier to have it.

The MP3, the idea was created by two germans that developed this kind of technology in the past decades. Later, in the 2000's MP3 devices were developed such as the worldwide known iPod. But it all started with teh creation of the file that could compress music into a smaller file for different purposes such as space and quality of sound.

 The idea of social networks is to connect different users. They are a means for people to communicate and create a public relationship betwen them, their acquaintances, and the aquaintances of their acquaintances. It work thanks to the internet, this means most Social Networks are online and required this system.

Examples of them are Facebook, Myspace, Hi5, Twitter The big boom of social networks, was in 2002 with a Network called Friendster.

Digital music is generally in Mp3 format that was developed by a German University. There are many digital formats for music such as .ogg, .wma, FLAC, .m4a The format Mp3 is so popular because it is a very lightweight file format. It is lightweight because they compress the sound in such a way that frequencies that are hard to hear for the human ear a completely cut off, so one may say mp3 is sacrificing quality for space. There are two main kinds of mp3 which are the ¨regular¨ one, and the variable bit rate mp3. Variable bit rate mp3 are of a much higher quality, there is an easily audible difference between the Vbr and the regular one, their quality can be as high as 320 kbps. There is a format called FLAC which stands for free lossles audio codec, which is an audio format without any extra compression. The FLAC format is generally preferred by audiophiles. There are currently earphones that have a mechanism that trys to ¨decompress¨ the mp3 by means of equalization (boosting the frequencies that the mp3 compression cuts off). Now a days there is a digital equivalent for once exclusively analog things, such as synthesizers and effect processors. mp3 is so popular that music players are very often called mp3 players mp3 is a derivation of mpeg mpeg sound files have different derivations appart from mp3