The research by flirting website Flirtomatic.com shows that online flirting peaks at 4.30pm, known as 'flirty four-thirty', as it's thought to be due to workers trying to waste that last hour before the end of their working day.
Flirtomatic has 100,000 people registered, 65% of who are 18-24 year olds. When Flirtomatic launched in December, it expected users to follow the traditional lunchtime rush.
Mark Curtis, chief executive of Flirtomatic parent company Handmade Mobile Entertainment, said: "We've been surprised by the levels of flirting that goes on just before the end of the working day."
"We think it might be a case of people thinking the day's over at 4.30, so fill their final half hour flirting online or on their mobiles. People like to commute home buoyed by receiving a new flirty message."
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