There are many site that allow you to create a blog, wiki, or other kind of website for free.

Blogging

• Blogger.com
• Posterous (allows you to blog by email)
• Edublogs.org
• Wordpress.com
• Wordpress software
• Mashable list of 40+ Free Blog Hosts
• See the Blogging & RSS Guide for more information about blogging.
  

Wiki's
     What is a Wiki?

Examples of Wiki's

• EFL Wikis
• List of Educational Wikis

Sites that host wiki's for free

• WikiSpaces
• PBwiki
• WetPaint
• Zoho Wiki
• MediaWiki
• Mashable's 30+ Wiki Tools and Resources

Website Builders (free)

• Google Sites
• Webs
• Yola
• Weebly
• Snappages.com

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Task: Create accounts at some of the above sites and write a blog reflection about them.  

Some recommended sites.

• Posterous.com -  Posterous Support  and Demogirl Screencast
• Wikispaces.com -  Wikispaces support  and Liz Davis Guide