About Face. Mark.Zuckerberg.’S DORM-ROOM CREATION is worth half a trillion dollars, has 2.3 billion regular users, and dominates its corner of the online advertising industry because its ads are so effective. Now Facebook is under attack from regulators, competitors, and privacy advocates—even as its growth slows. The challenge: mollify its critics without destroying its business model. Fortune’s inside look at an impossible dilemma. Text by Michael Lev-Ram. Art Direction by Josue Evilla.

Collaborator Xavi Pulido