Excerpts from those links:
The USA has "by far" the world's largest cyber-army, and contracts corporations who set up and pay people to post in social media "around the world" using multiple "using fake online personas to influence internet conversations and spread pro-American propaganda"
"Centcom's contract requires for each controller the provision of one "virtual private server" located in the United States and others appearing to be outside the US to give the impression the fake personas are real people located in different parts of the world."
“The Centcom contract stipulates that each fake online persona must have a convincing background, history and supporting details”
… “the software could allow US service personnel, working around the clock in one location, to respond to emerging online conversations with any number of co-ordinated messages, blogposts, chatroom posts and other interventions.”