The result is that, rather than being someone that defies all calculation, love is now big business worth an annual billion internationally and growing at 70 per cent a year – with high-tech venture capitalists, psychologists and software engineers reaping vast rewards.
Academics, meanwhile, are fascinated by the data being gathered — and largely kept secret — by the dating industry.
But other sites, which can cost up to £3,000 a year to join, offer their clients a bespoke selection of potential partners to share your love of sushi, dachshunds or The Apprentice.
“I’ve found a tendency for the 'grass is greener mentality’ to set in, where the person they’ve set their sights on seems great until they decide to check out 'just a few more profiles’ and spot an 'even better’ singleton,” warns relationship expert Dr Pam Spurr, author of Love Academy.
One in five relationships in the UK starts online, according to recent surveys, and almost half of all British singles have searched for love on the internet.
Just today, nine million Britons will log on looking for love.
“We’d love to get hold of more of it, but they’re not keen to share though we’re in discussion with a few of them,” says Robin Dunbar, professor of evolutionary psychology at Oxford University and author of The Science of Love and Betrayal.
“They have a huge database and they also can follow couples’ stories through, which hasn’t been possible so far.” For most of history, using a third party to help you find love was the norm.