Couples posting lovey lovey messages to each other on their public social media.
Everything from Happy Birthday to my wonderful wife to OMG thank you so much amazing DH for the really expensive xyz.
Presumably as they have such amazing relationships and they live in the same house they can say these things easily face to face.
Is it to run others' who may not be so fortunate noses in it? Do their partners need this public validation? Do they not actually talk to each other?