If I ever go back for my PhD. I have always planned to do a paper on Social Medias effect on Nations/States ability to wage war. As we all know people don't go to war, governments do. As people meet others outside their own countries it should make it harder to convince the populace at large to support a war. Say you "talk" to someone in Zambezie and hear about their lives and family you're going to be harder to convince that the people in that country are: "a yellow menace", "red plague" or other stereotype. You're just not going to be so willing to see anyone from that country killed, they won't be just faceless enemies.