The following blog examples provide practical examples of the kind of things that you could start doing with your students.
Royds Languages Department have a good example of a blog featuring lots of student work.
Chiltern Edge MFL department are a great example of a blog with lots of integrated interactive stuff and you can see examples of the kinds of tasks teachers are giving their students and the work they get back.
Marie-France Perkins’ blog is called Sans Problème (UK). Regularly updated, very varied with lots of student work.
Enjoy! And remember if you want to use the blog just to communicate with your own students just put protect your posts with a password which only your students will have.