The Internet has made it much more effective and cheaper to spread propaganda.
It is true that authoritarian governments increasingly see the internet as a threat in part because they see the US government behind the internet. It would not be accurate to say they are reacting to the threat posed by the internet, they are reacting to the threat poised by United States via the internet. They are not reacting against blogs, or Facebook or Twitter per se, they are reacting against organizations like the National Endowment for Democracy funding bloggers and activists.
