To lead the project, Mr. Zuckerberg brought on an old Harvard friend, Sam Lessin, through the October 2010 acquisition of his file-sharing start-up, Drop-io.

WSJ: Facebook's New R&D Machine

David Fischer, who oversees all advertising, and Sam Lessin, the inventor of the Timeline, explain how they work together and where this world-changing colossus will go next.

FORBES: Here Comes the Techonomy Conference

The Techonomy 2012 conference outside of Tucson, Ariz. wrapped up with a session featuring two Facebook team members: Sam Lessin, Project Manager, and David Fischer, VP of Business and Marketing Partnerships.

FORBES: Read All About It: The Facebook Effect