I just managed to make a blog for my teaching purpose. It's up since this July, provided by Edublogs.org. They manage to gather educators and students for having a blog with educational topic (or else).
There's an option for 'teacher' and 'student' though I don't know what the Dashboard would look like for students because I opted for 'teacher'. Drop by 'Quick, it's chemistry!' and leave a comment for me. Suggestions are highly appraised. Thank you.