"When we watch Harry and Charlie, we briefly enter into a state of “high arousal,” as the autonomic nervous system mirrors the flurry of feelings on-screen. Our heart rate increases and sweat glands open; the body prepares for action. These are the same physical changes that occur when we encounter any strongly emotional content, from a scary movie to a sappy love poem.
In his study, Mr. Berger demonstrates that such states of arousal make people far more likely to share information. For instance, when he had subjects jog in place for 60 seconds—Mr. Berger wanted to trigger the symptoms of arousal directly—the number of people who emailed a news article to their friends more than doubled. He also boosted levels of “social transmission” by showing his subjects frightening and funny videos first. “Levels of arousal spill over,” Mr. Berger says. “When people are aroused, they are much more likely to pass on information.”
http://www.wired.com/wiredscience/2011/07/why-do-viral-videos-go-viral/
"Eine Untersuchung bei der New York Times ergab, dass es Nachrichten mit emotionalem Inhalt... mit einer sehr viel höheren
Wahrscheinlichkeit in die Liste der am häufigsten weitergeleiteten Artikel schaffen als wichtigere, aber nüchterne Nachrichten...
Ob eine Nachricht weiterverbreitet wird, hat viel mehr mit dem eigenen Befinden und der Umwelt zu tun als mit dem eigentlichen Inhalt",
SZ, 29.08.11