A US computer programmer is paying a woman £5 an hour to slap him if he uses Facebook at work.Maneesh Sethi reckons employing Kara has helped quadruple his daily output, reports The Sun.Mr Sethi, from San Francisco, placed an advert on classifieds website Craigslist to recruit someone willing to monitor him at work.He said he felt embarrassed after calculating he wasted around 19 hours every week looking at social media websites.He wrote on his blog: "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?"