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There is "little evidence" that "algorithms can predict whether people are good matches or will have chemistry with one another." But curriculum director Emily Helfgot, 42, and librarian Robert Weinstein, 44, are the lucky ones. He had just gone back online after a previous relationship fell apart."What I learned was exchange a couple of emails, and they should be meaty, you should be getting something out of them and then you should meet as soon as possible," she said.

It’s about having the same ambitions, interests and goals in life.” Marriage – or at least love – is still the end goal for many who sign up for sites, such as Match or e Harmony, that focus on compatibility and require users to submit lengthy profiles.

"It's creepy for men to hit on you in a bar, or in the street or in a train," she said.

"Most girls have that little edge that something bad will happen, that they (the men) are freaks. "I've never met up with someone I haven't talked to for a few days." But an online facade can quickly unravel in person.

"One guy I thought was cool and normal told me 'I'm bisexual and I'm probably going to jail because of all these drugs I sold.' And I was like, 'I don't actually like you very much,'" she says.

Happy ever after Sites provide access to more potential partners, but browsing and comparing can reduce willingness to commit to one person, cautions an article in the journal Psychological Science. Helfgot says she used dating sites "on and off probably for three years" before meeting Weinstein.