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But new evidence suggests that the urge to check for updates on social networking sites is more difficult to resist than the urge to smoke a cigarette or drink a glass of wine.
Researchers at the University of Chicago Booth School of Business in America fitted 250 test subjects with devices which monitored nearly 8,000 reports about their everyday desires.
And one of their key findings was that our resistance weakens every time we successfully resist the temptation to give in to an urge - with our willpower weakening throughout the day.
The research has been published in the Psychological Science journal, with lead researcher Dr Wilhelm Hofmann saying: "As a day wears on, willpower becomes lower and self-control efforts are more likely to fail."
Do you cave in and check your Facebook in the afternoon? Comment below...