It's interesting you have this opinion; I figured this would be the biggest draw for corporations-- they're no longer beholden to some third party for their media presence-- it's all hosted and controlled by themselves;.
In email terms, it's the difference between tide@gmail.com and tide@tide.com.
Edit: I don't have any idea why I went with tide, so if you find yourself wondering why I did that, get in line. haha