e Harmony is another massive player, with 3 million users signed up.

But size isn’t everything – as anyone who has just wrapped up a three-hour swiping session on Tinder will attest.

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It seems unavoidable that if we have filters and tick-boxes for features and likes or dislikes, we could be cutting off literally thousands of potential suitors because of something we might have thought minor or irrelevant if we met in the flesh.

And, by the way, the tick-box that chooses whether you’re shown people with children or not can have an even more dramatic result, with 90% of the people I asked (a straw poll of 10 in the office) saying they’d chosen not to be shown people with children.

Cons: The lengthy survey you must complete before you sign up.

It is 100s of questions long and asks many probing questions about religion and moral views.

However, they do have a live help service at their homepage to talk you through joining.

Pros: Uses compatibility testing to match you with someone who shares the same worldview as you.

And there’s no sense in ruling someone out for reasons that may become insignificant once you’ve met in real life.

‘Only show me people without children’ ‘Only show me men over 6ft 1in’ ‘Only show me vegetarians’ ‘Only show me people who don’t want kids’ The tick-boxes on many dating sites are a common part of the structure of the sites – and people often fill them in and make their choices quickly, based on in-the-moment gut feeling, prejudice or a past bad experience.

Too many members with no filter can result in either hours of swiping to find someone you fancy, or hundreds of messages in your inbox that you’ll never have time to read.