But for many couples, being “Facebook-worthy” confers a status on a relationship. When a couple was “going steady” in the 1950s, the young man might have let his girlfriend wear his Varsity team sweater or given her his fraternity pin. But the 1960s swept aside those rituals. Now the Facebook link has become a publicly-recognised symbol of a reasonably serious intent short of being engaged or moving in together.

“For those in a relationship, the theme that kept echoing was that Facebook made it official,” said Nicole Ellison, an assistant professor of telecommunication and information studies at Michigan State University who has studied social networking sites. “That was the term they used. And when the relationship fell apart, when you broke up on Facebook, that’s when the breakup was official.” Facebook even produces a little red broken heart icon when a couple splits up.