The global economy would fracture, is what would happen. A good chunk of the top performing stocks would disappear, affecting banking, retirement, housing, just everything. Most of the communication channels people use today would disappear. The online tools even non-ad-businesses use to function would stop, so those businesses would grind to a halt. News would disappear. Products would stop getting made. (US) Politicians would freak the hell out because now they don't know how to get elected. It would be a categorical economic and social disaster.