Edublogs

Blogging with Edublogs
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 * Free (for individuals) blogging service (paid 'Campus' edition available for schools/districts)
 * Uses #1 open source blogging engine in the world - Wordpress
 * Completely hosted and managed for you - ready to use in seconds
 * Powerful, flexible
 * Can be set so that all content is moderated (approved by teacher prior to posting)
 * Visually stunning, many different 'themes' available
 * Supportive, education-focused user community