In the age of smartphones, protests are no longer confined to streets and squares. They unfold instantly across digital networks, empowering millions to coordinate, document and amplify their voices in real time. Governments face a new reality: power is now as much about control of the signal as control of the street. OP Singh, DGP, is his upcoming book on ‘Crowd Engineering’ says that this transformation demands a rethink of how states engage with crowds, how movements wield influence—and how legitimacy itself is earned in a connected world.