Who invented Facebook’s Like button? It’s complicated, say the authors of this new book

The internet wouldn’t be the same without the Like button, the thumbs-up icon that Facebook and other online services turned into digital catnip.

Like it or not, the button has served as a creative catalyst, a dopamine delivery system, and an emotional battering ram. It also became an international tourist attraction after Facebook plastered the symbol on a giant sign that stood outside its Silicon Valley headquarters until the company rebranded itself as Meta Platforms in 2021.

A new book...