I'd move Boston into tier 3. It's actually an incredibly rich ecosystem, I'd put it #3 just behind SF/Seattle in terms of real-world impact, market cap of tech

I'd move Boston into tier 3. It's actually an incredibly rich ecosystem, I'd put it #3 just behind SF/Seattle in terms of real-world impact, market cap of tech co's, etc. But no one really moves to Boston to start a company, they tend to be the folks who hung around after Harvard/MIT.