#BBCTrending: The secret to a great Tinder photo

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Tinder is a dating app based on first impressions. Ever since it arrived, users have tried to figure out the secret to what makes someone swipe right when they see a photo (signifying a desire to know more) versus swiping left (a quick rejection).

In New York, some romantic hopefuls have turned to a photographer who specialises in Tinder head shots. A professional photo, they say, will catch the eye of potential partners.

But one writer found that it's not the quality of the photo but the signifiers it includes - messages about race, class and educational background - that is most likely to influence swipes.

Colm O'Molloy talked to both camps to discover the secret of love at first sight.

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