> Mr. Biden’s biggest problem is structural. Most of our online political communication takes place on internet platforms that are designed to amplify content t

> Mr. Biden’s biggest problem is structural. Most of our online political communication takes place on internet platforms that are designed to amplify content that provokes strong emotional reactions, often by reinforcing tribal identities. Mr. Trump’s unfiltered, combative style is a natural fit for the hyperpolarized audiences on Facebook and Twitter, whereas Mr. Biden’s more conciliatory, healer-in-chief approach can render him invisible on platforms where conflict equals clicks.