Question
For the last 10 years or more there has been a lot of talk of India, China, Silicon Alley, etc. Yet Twitter, LinkedIn, Facebook, Uber, etc. are all from Silicon Valley.
Answer
Lots of companies there have grown too large or not provided enough internal growth roads for employees to retain top talent over time. Start small, get really epically large then hemorrhage top talent into the local ecosystem. If you're an NPR fan there's a whole This American Life on why Chicago needs to have a Groupon type of firm get all big and uncool to work for so that the local economy spawns more innovation.
