newsgroups are essentially where the internet began. It started as a bulletin board of sorts and has gone onto host pictures, movies, applications, discussions, etc.
I use newsgroups daily. Just be wary it also a place for tons of spam and malware also. But those are generally easy to spot.
Go forth and learn:
http://en.wikipedia.org/wiki/Usenet
http://en.wikipedia.org/wiki/Newsgroup
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