On the eve of the unveiling of Fast Company's 2013 list of Most Innovative Companies, we talked to Facebook [3] product designer and
Daytum [4] cofounder Nicholas Felton [5]. He took a break from work on his own forthcoming Annual Report [6] to take us inside the creation of one of Facebook's most sweeping, high-stakes product launches in its history--Timeline, which Felton inspired [7] (along with Mark Zuckerberg, as he describes above). Here's what happened leading up to the day your social graph changed forever.