Twitter is just a ticket booth. Had over request, get tickets back. Except the ticket booth is in the middle of Times Square in New York and it needs to serve

Twitter is just a ticket booth. Had over request, get tickets back. Except the ticket booth is in the middle of Times Square in New York and it needs to serve millions of people per second and be instantly accessible around the globe. The complexity is in the infrastructure, not in the complexity of what they're serving.