You know the couple: every meal, every crisp winter walk, every #datenight is documented with a smug Facebook picture and a cloying caption dripping with smug contentment.
And you think to yourself: they must really fucking hate each other.
Everyone knows that when you're really having a good time, stopping to get your phone out is the furthest thing from your mind, and now a sexologist has confirmed the theory in an interview with Mail Online.
"Often it's the people who post the most who are seeking validation for their relationship from other people on social media," said Nikki Goldstein.
"The likes and comments can be so validating that when someone is really struggling, that's where they get their up from – not the person making the gesture, but what other people will say about it."
It's far from the first time this observation has been made of course. Way back in 2014 the Personality and Social Psychology Bulletin concluded that people who post endlessly about their relationship on social media are usually the most insecure about them.
So if you have a mate committing this cringer on a regular basis, maybe leave this story on Facebook and hope they get the hint.