You've just checked Facebook for the latest status update and Twitter for any new tweets. So what do you do now? Check them again of course. According to a study of people's everyday desires, resisting the urge to check social networking sites for updates was harder than saying no to that second glass of wine.
http://www.dailymail.co.uk/news/article-2095464/Social-networks-addictive-cigarettes-alcohol.html?ito=feeds-newsxml