A US man is paying a woman £5 an hour to hit him if he uses Facebook at work.

Computer programmer Maneesh Sethi took the drastic measure after calculating he had been wasting around 19 hours a week on the social networking site, so he placed an advert on classifieds website Craiglist for an individual to slap him if he uses the webpage during work hours.

''Having worked mostly alone, on my computer, I found that the majority of my time is spent unproductively.''

In a post on his blog, he wrote: ''Humans are social animals - we aren't designed to live and work alone.

''Now that the average worker's job is to sit in front of a computer, often with no supervision, it's no surprise that we are only productive three days each week.

''Having worked mostly alone, on my computer, I found that the majority of my time is spent unproductively.''

''I figured, 'This is stupid, why am I wasting this time doing nothing?'

''When I have a boss, or someone of authority watching me, I always get my work done. How can I simulate the authority figure?''

Maneesh now believes employing Kara has helped to quadruple his daily output at work.