In 2004, Andrew McCollum designed Facebook's first logo for his Harvard classmate, Mark Zuckerberg.

People later wondered who the mysterious face on the logo was or if it was even a real person. Indeed, it was. The face is that of Al Pacino.

"Zuckerberg's friend and classmate Andrew McCollum designed a logo using an image of Al Pacino he'd found online that he covered with a fog of ones and zeros the elementary components of digital media," writes David Kirkpatrick in The Facebook Effect.