Image by cleopatra69 via Flickr
The production business is, in my opinion, one where the use of social media can be quite helpful when used judiciously. The amount of time consumed with social media needs to be balanced. Also the content of the blog or tweet is very important as business people are so barraged with media that unnecessary or unwanted communications can make the sender into an irritant rather than helpful.
The company vs a producer vs the director or editor or talent each have different needs in communication. Part of the idea is to keep yourself top of mind to customers and potential customers, without being a pest.
Like most of life, the best solution is finding the right balance.