[jiffylu]

Kayak-

I think the biggest difference is the funding environment. In a way, it's a networks effect problem.

There are consumer Internet companies that made it big in the valley, in the process, creating millionaires who "get" consumer Internet. They then go on to create or fund other consumer Internet companies.

Meanwhile, in Boston, there hasn't been a significant consumer Internet exit.. at all? (Wow, I can't think of one right now) So the promising consumer Internet businesses and talent in Boston, who can't find the seed funding or the mentorship, move out to the valley.