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BBS (Bulletin Board System)
It was a computer server that allowed users to connect to the system using a terminal program. After logging in, the user could perform functions such as downloading software and data, reading news and newsletters, and exchanging messages with other users. -
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History of social network
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IRC (Internet Relay Chat)
is a text-based chat system for instant messaging. IRC is designed for group communication in discussion forums, called channels, but also allows one-on-one communication via private messages as well as chat and data transfer, including file sharing.