EduBlog
Ruth Becerra did a great job explaining why to blog and gave some great examples on the Blogger page, so here are some reasons why you might want to choose EduBlog over Blogger:
Edublogs has a free version but to access better features, obtain more support and to create student blogs, you (or your school) will need to pay for a subscription. Edublogs is purely for education with no adult content, and allows you to create student blogs from a class blog (as part of the paid account). The personalized support offered by Edublogs is excellent.
Blogger is Google’s blogging platform and is totally free. Blogger has a good range of theme templates and sidebar gadgets available, however, I have found the overall features to be more simplistic than Edublogs. This is not necessarily a bad thing for some teachers and students who want their platform to be as simple as possible. Specific support is also much more limited than Edublogs, but because of its large worldwide usage, there are a lot of Blogger forums, help sites and videos on the web.