Movie blogs are a great marketing tool for movies as they engage audience before even theh movie was launched and build interest for the future movie. In the same time. it creates a solid fan base and gives the audience what it wants: behind the scene details about production and actors. Here is a part of the blog for The Hobbit (http://www.thehobbitblog.com/)
In his final production diary of 2013, Peter Jackson takes you behind the scenes for the scoring of The Hobbit: The Desolation of Smaug.