Facebook at work amounts to social “not-working”, according to a new survey that shows employee productivity is hit by people socialising on the internet during office hours.

A new study by Boston IT advisory firm, Nucleus Research found that, companies that allow users to access Facebook in the workplace lose an average 1.5% in total worker productivity.

Nearly half of employees in the recent social net-working study use Facebook during work hours some as much as two hours per day. The average worker uses it for 15 minutes a day, and most couldn’t come up with a legitimate “business reason” for logging on.

The survey of 237 employees also showed that 77% of workers who have a Facebook account use it during work hours. And “some” employees use the social networking site as much as two hours a day at work, the study found.

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