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Leo Tolstoy opened Anna Karenina with a line considered one of the most iconic in literature: "All happy families are alike. Each unhappy family is unhappy in its own way." That line looks incorrect, because people are happy in a lot of different ways.

The unhappy people in one person's life all share a theme. They consistently compare themselves to others, and their entire lives are measured by how they stack up against someone else's.

The fastest way to kill something beautiful is to compare it to something else. Social media makes that hard to avoid, because the algorithms intentionally thrust the most unfavorable comparisons right in front of your face. If happiness is the goal, resisting them is the work.

Why is Tolstoy's line called the Anna Karenina principle?

Biologist Jared Diamond used the name in his 1997 book Guns, Germs, and Steel. He applied it to the domestication of animals, where a species had to clear many separate hurdles, such as diet, temperament, and breeding in captivity. Failing any one of them ruled a species out, so the unsuccessful candidates failed in many different ways while the successful ones all shared the same set of traits. The principle has since been borrowed in statistics and ecology.

How did researchers first study comparing ourselves to others?

Psychologist Leon Festinger proposed social comparison theory in 1954. He argued that people have a drive to evaluate their own abilities and opinions, and that without objective measures they judge themselves against others. Later work found that comparing upward, to people who seem better off, tends to lower mood and satisfaction. Comparing downward tends to lift it briefly.

Why do feeds make comparison so easy?

Most social platforms rank posts by predicted engagement, meaning how likely people are to react, comment, or linger. Posts showing vacations, promotions, and polished bodies draw strong reactions, so they get shown widely. A feed is therefore a selection of the most striking moments from thousands of lives rather than an average of them. Studies since the 2010s have linked heavier passive scrolling to lower reported well-being, though the size of the effect is debated.

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