COVID-19 and Friendships: What the Pandemic Changed

The Natural Experiment

Before the pandemic, measuring the causal effects of isolation on health was difficult — because lonely people differ from non-lonely people in many variables. COVID-19 changed that: forced isolation hit everyone, regardless of personality or social skills.

The result confirmed what research on loneliness and health had shown for years: a lack of social interaction leads directly to measurable psychological and physical decline.

The Loneliness Trajectory

The Bertelsmann Stiftung (2024) documents the trend for Germany: from 14–17% (pre-pandemic), loneliness among 16- to 30-year-olds jumped to 41%in 2020. After restrictions eased it dropped to 36% (2022/23) — but the most recent figure shows 46%.

The incomplete recovery has a clear reason: weak ties lost during the pandemic cannot simply be restored. Without regular contact and familiarity, these relationships faded away.

What Survived, What Didn’t

The pandemic acted like a filter: close friendships— Dunbar’s inner circles of 5 and 15 — remained relatively stable. People found ways to stay in touch: video calls, walks, online gaming together.

Peripheral contacts suffered most: work friendships, gym acquaintances, club mates. These relationships depended on physical proximity and regular encounters — both of which disappeared.

Long-Term Consequences

The pandemic didn’t just destroy individual friendships; it impaired social skills— especially among adolescents whose social development was interrupted. Many report heightened social anxiety and difficulty forming new connections.

Dunbar (2025) emphasizes: the neurochemical systems that support social bonding need regular activation. Months without physical social interaction caused a deficit in β-endorphin stimulation that could not be compensated immediately.

Frequently Asked Questions

How did the pandemic change friendships?

COVID-19 forced an abrupt halt to physical contact. Loneliness among young adults surged from 14–17% to 41%. Many friendships did not survive the distance — especially weak ties were lost.

Did friendships recover after the pandemic?

Only partially. By 2022/23 loneliness fell to 36%, but the most recent measurement (2024) shows 46%. Recovery is incomplete because lost weak ties are hard to rebuild.

Why was the pandemic a natural experiment?

For the first time, entire populations were simultaneously cut off from social interaction. This made it possible to measure the causal effects of isolation on mental health directly — without the usual selection effects.

Which friendships survived the pandemic?

Primarily close, emotionally deep relationships. Dunbar’s inner circles remained relatively stable. Peripheral contacts — work friendships, gym acquaintances, casual friends — were hit hardest.