Viral Loops Come from Gaps in Relationships

The strongest viral loops in social products rarely begin with a referral reward. They begin with an experience that feels incomplete without another person.

Apps such as Gas, tbh, BeReal, Poparazzi, Locket, and Saturn each made participation more meaningful when friends were already there. That structure creates a social gap: a person wants to invite someone not to earn points, but to complete a shared context, see a response, or make a small moment visible.

This is not a license to manufacture pressure. The test is whether the invitation gives both people a clearer, more enjoyable experience. Build for a specific relationship and a specific occasion. If the product works just as well alone, the loop is likely an acquisition mechanic rather than a durable network effect.