http://tinyurl.com/yrxgl5 This study has been all over the media. But I wonder how many people know how many serious flaws it has? It was based on data from a study designed for an entirely different purpose. For instance, they never actually tried to determine how many friends a person had, how long they knew them, etc. They relied entirely on a few limited contacts used as backup, just in case the reseachers lost touch with the respondants.