The week-long poll conducted in Germany by the University of Chicago Booth School of Business classified checking social network tweets, pictures, comments and other posts as stronger than sex and cigarettes in terms of temptation. “Desires for media may be comparatively harder to resist because of their high availability and also because it feels like it does not cost much to engage in these activities, even though one wants to resist,” Wilhelm Hofmann, the study’s lead author, told the Los Angeles Times.