• Application Servers

• JBOSS
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• Cellular/Mobile Phones

• IPhone
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• General
• Blackberry

• Database Management Systems

• MySQL
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• Hardware

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• IT Vendors/Companies

• Google
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• Sun Microsystems
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• Hewlett-Packard Company (HP)
• Intel
• Advanced Micro Devices (AMD)
• Cisco
• Open Source
• Yahoo
• Verizon Communications
• Amazon.com, Inc.

• Libraries

• OpenSSL

• Linux Distros

• Fedora
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• Yellow Dog
• CentOS

• Operating Systems

• Linux
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• Popular Websites

• Twitter.com
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• Digg.com
• Monster.com

• Search Engines

• Bing
• Google Search
• Yahoo Search
• Ask.com

• Servers

• Apache Web Server
• vsftpd FTP Server

• Social Networks

• Facebook
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• Other Social Networks
• Hi5
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• Plaxo

• Technology

• Business
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• New Feature/Release
• Software
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• Clustering

• Virtualization

• VirtualBox
• VMware
• Virtual PC

• Web Development

• PHP
• Perl
• Javascript
• Web Design
• Adobe Flash
• Ruby
• Python
• Java
• AJAX
• Graphics Design

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• Big brands use Twitter to push corporate messages