Free Multi-user Blog Software

Question: Our district is considering the use of student and teacher blogs, and we are looking for free blogging software options that will support multiple users. What software options are available?

The IT Guy says:
Two open-source blogging software tools to review and consider are b2evolution, which calls itself a "multiuser multilingual multiblog engine," and Wordpress Multi-User.Currently b2evolution does not support comment moderation (without hacking the source code), so for educational contexts Wordpress MU may be preferable. Both are open source, free, and just require one MySQL database each. Wordpress.com is using Wordpress MU and hosting over 250K blogs, so it is robust as far as scalability goes.

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