The four -- Who are these companies and why write about them? -- Amazon -- How Amazon became the most disruptive firm in the largest economy -- Apple -- Tech goes luxury -- Facebook -- Love is key to longevity and great advertising -- Google -- Our modern-day god -- Lie to me -- The four and funny business -- Business and the body -- All businesses appeal to one of three organs -- The t-algorithm -- What it takes to get to a trillion -- The fifth horseman -- Who will be next? -- The four and you -- Follow your talent, not your passion -- After the horsemen -- Where are the four taking us? -- Acknowledgments -- Illustration credits -- Notes -- Index.