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Blog is a personal online newspaper containing a mixture of comments and reflections on any subject such as travel, polity, cinema or everyday life.
Blogs are like diaries. The differents is that everyone can read them

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Facebook is a website that connects people with friends and others who work, study, and live around them. People use Facebook to send messages, to upload photos, to share links and videos, and to learn more about the people they meet.

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Wikipedia is an online encyclopedia. Each person can write an article and he can download  up on Wikipedia. The article  of Wikipedia is colled WIKI.
Wikipedia editors control each article

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The Internet started as a small government project in the USA in the 1970.  The American Defence Department linked the computers to facilitate the transfer of data. So a lot of computers were connected to this system: this was the begining of the Internet. At the first the Internet was used to connect separate computers and to send e-mail messages.

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To surf the Net, I need to use a programm to read pages, called browser, such as Firefox or Internet Explorer.
To seach a topic, I need to use a search engine. There are many search engines: Google, MSN and Alta Vista.

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The Word Wide Web stored millions of web pages on web servers. The pages are written in a language called HTML.
Each web page has an address or URL.
The URL will have the format "http" and a domain (such as "it").
Web page are connected by hypertext links.

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Initially Internet was very complicated. In 1989 Tim Bernes Lee invented the Word Wide Web. It made up of millions of page of text immages,audio and video contents.