You can’t browse pictures or profiles – you wait to be matched by the mystery algorithm after answering the 400 questions – then you are guided through a contact process.

Some may think it lacks the spontaneity of other dating sites – and you certainly can’t use it to get a quick date for the weekend.

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Some find this a barrier to join, fans say it weeds out the casual chancer from those truly looking for love – and means you don’t have to wait to broach tricky topics.

Pricier – it’s £44.95 for a month, but that drops to £12.95 per month if you sign up for a year.

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.

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, yet many friends dating (or married to) previosuly single parents tell me they would never have selected someone with a child if they had a tick-box to rule them out, and indeed on dating sites had filtered out people with children.w=300" data-large-file="https://metrouk2.files.wordpress.com/2016/12/mg_illustration_edit_lokey_chirpse_comp.gif? w=1024&h=585" class="img-align-center size-large wp-image-6347738" src="https://metrouk2.files.wordpress.com/2016/12/mg_illustration_edit_lokey_chirpse_comp.gif? w=1024&h=585" alt="Metro Illustrations illustration request: How to low-key stalk you crush online Picture: Liberty Antonia Sadler /uk" width="1024" height="585" / ‘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 tickboxes 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.But too many filters and rigid check-boxes can have you dismiss huge numbers of people at once – something that apps like Bumble, Happn and Tinder tried to do away with (though that brings its own set of issues).One 5ft 10in user reports she saw only 400 potential men to browse when she logged in to When she reduced her height to 5ft 9in, that rocketed to almost 2,000.Cons: The lengthy survey you must complete before you sign up.