LikeA riveting, insider's look at the creation and evolution of the like button, and what it reveals about business, technology, and innovation and us. Over seven billion times a day, someone taps a like button. How could something that came out of nowhere become so ubiquitous, so familiar, and even so addictive? What problem does it solve for people, and why does a 'like' feel so good? And by the way, who invented the like button in the first place? In