2．Social networks are considered to be Web 2.0.What does this mean？To understand this，it's important to understand what the original web did (often called Web 1.0)．

　　3．Back in the nineties，the Internet was a place to go to read articles，listen to music，get information，etc.Most people didn't write anything on the sites.They just looked through the sites and took advantage of the information or resources provided.Of course，some people did create their own sites.However，________ was difficult.You needed to know the original language the Internet used.It certainly wasn't something most people wanted to do as it could take hours to get a basic page just right.Things began to get easier when blogs were introduced.With blogs，many more people began writing posts，as well as commenting on other people's blogs.

　　4．In 2003 a site named MySpace took the Internet by storm.It was trying to imitate the most popular features of Friendster，the first social networking site.It quickly became popular among young users.Soon everyone was trying to develop a social networking site. The sites didn't provide content to people；they helped people create，communicate and share what they loved including music，images_and_videos.

　　5．Relying on the desire of users to communicate with each other is the key to the success of Web 2.0 companies.

　　1．What is the main idea of the text？(no more than10 words)

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