They don't care and don't want that. But the government could host their announcements, comments and videos. Using twitter/youtube is the same as stating that

They don't care and don't want that. But the government could host their announcements, comments and videos. Using twitter/youtube is the same as stating that we will put all information for our citizens in <SomeRandomNewspaper>. Of course then it's unclear why some elected official couldn't have their own private account anywhere on the web, and it's really hard to tell what's job related and what is not for somebody who is ranking high enough. One way or another, as it's been for ages, money rules the world and with quick technological advances corporations are ending up with more of it than governments. I just can't quite figure out China in that viewpoint of mine.