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email is launched in th US for people to communicate in a faster way and from long distances, the majority who had this service were people with a lot of money.
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yahoo is launched as a place were you can find news and tips for things, also you could talk with your friends and other people you didn't know.
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sixdegrees is a place were you can find things that are trending in different categories as movies, songs, places,etc.
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blogger is place were you can create blogs were you can give information about a specific topic, also in here you could make opinions about other stuff,
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facebook was launched for harvard students as a project, some months after, Facebook was already an official social media for everyone of ages 13 or over. the main idea of Facebook is for you to talk, meet, share and interect with other people you might know or might not know. thats wahy nowadays Facebook is such a trend and is so successful.
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friendster was a place were you could talk to your friends meet new people, you couldn't share things or send pictures.
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twitter was a place were you could talk to people, give your opinion and post things you liked.
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my space is a place were people can make a make a blog about yourself and you can write about you and your experiences, you could also sager this posts.
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linked in is a place were you can find different job offers and you can write about your lab oral life and this will help you in an easier way to get a good job.