A new book, "Like: The Button That Changed The World," delves into the convoluted story behind the Like button.

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.

A new book, "Like: The Button That Changed The World," delves into the convoluted story behind the Like button.

A new book, "Like: The Button That Changed The World," delves into the convoluted story behind the Like button.

A new book, "Like: The Button That Changed The World," delves into the convoluted story behind the Like button.

A new book, "Like: The Button That Changed The World," delves into the convoluted story behind the Like button.