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• Amazon.com, Inc.

• Libraries

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• Operating Systems

• Linux
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• Popular Websites

• Twitter.com
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• Search Engines

• Bing
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• Yahoo Search
• Ask.com

• Servers

• Apache Web Server
• vsftpd FTP Server

• Social Networks

• Facebook
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• Hi5
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• Technology

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• Web Development

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• Big brands use Twitter to push corporate messages