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Newsgroups: Internet Newsgroups
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There are tens of thousands of newsgroups. Some of them are applicable to a global audience; others are more applicable to a country, city, or organization. Most of the newsgroups are available to everyone on the Internet. However, some of the newsgroups have a limited audience. For example, there may be a newsgroup for Gravel Quarry 101 at the Bedrock Trades School, but it is not available or of interest to anyone outside of the school.
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Note: Some Web sites have their own versions of newsgroups. They often go by another name, such as communities. They operate similarly to newsgroups, but they are not officially newsgroups because they don't operate through that part of the Internet. One such site is Google Groups, listed above. Another is Yahoo! Groups (http://groups.yahoo.com/).
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Some groups allow subscribers to post or download not only text, but files like music, pictures or videos, these are known in the newsgroups world as binaries. As always, caution should be used when downloading files from the Internet, but you'll find this a great way to share that killer song you've just mixed.
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Internet Newsgroups