Ideas from books, articles & podcasts.
It's a social psychology concept and it refers to the phenomenon of "I'm part of a couple!" displays on social media: how romantically involved users present their relationships online (e.g, couple photos, couple related relationships status, mentioning partner in social media posts, etc.)...
Certain people are more likely to use romantic status displays than others:
Posting couple photos and other related social media displays influences other people to see the profile owner as more likable and as more likely to be in a satisfying and committed relationship.
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