1. Mark Zuckerberg (www.facebook.com)
Mark Zuckerberg is one of the most powerful person on internet. He is world's youngest billionaire. Facebook is most widely used social networking website globally. It was started by Mark at Harvard from where he dropped out to built his own company.
2. Kevin Rose (www.digg.com)
Digg is a social news website which allows people voting the posts. Digg started out in November 2004 by Kevin Rose. While younger, Kevin worked as a breadstick maker at a restaurant. And now today, digg is one of the top earning blogs.
3. Matt Mullenweg (www.wordpress.com)
WordPress is a free and open source blogging tool and content management system (CMS) based on PHP and MySQL. Mullenweg attended the University of Houston and majored in Political Science before he dropped in 2004 to pursue at job at CNET Networks. It has many features such as widgets, themes, plugins etc. It is the most popular blogging platform on internet.
4. Pete Cashmore (www.mashable.com)
This is another content based blog which is earning really very high. He grew up in Banchory, and founded Mashable in Aberdeen, Scotland in 2005 at age 19. This blog has articles about Social Media, Tech, Business, Entertainment, US & World etc..