Fortune Global 100 and social media

An interesting free report from PR firm Burson-Marsteller on usage of social media amongst the Fortune Global 100 companies.  Twitter, Facebook and YouTube seem more popular channels than blogs for these companies.  I wonder whether blogging has peaked or is on the decline as a communications channel for corporates.  I would not be surprised - short-form nature of Twitter, pervasive nature of Facebook and appeal of video probably more attractive to most punters than using an RSS reader to track blogs. However, I think blogging will always have a place for people/companies wanting to put out information that cannot be encapsulated in 140 characters and/or who don't want to play within the closed garden of Facebook.  Perhaps blogs, once derided for being no more than the narcissistic ramblings of lonely people, will become the primary online spaces for considered writing and discussion.  That is certainly already the case with some of the blogs I subscribe to.