Why companies move to San Francisco…

In the Atlassian interview I ask Mike Cannon-Brookes, CEO of Atlassian, why he moved his company to San Francisco (it was started in Australia and still has most of its engineering there). That part of the interview is about 12 minutes into the interview.

He isn’t the only one. I’ve noticed a ton of companies moving their headquarters to San Francisco from around the world. When I interview them I ask what drove them to do that.

The reasons I’ve heard so far:

1. Access to talent.
2. Access to marketing/PR.
3. Access to money.
4. Atmosphere (more geeks per square foot here than anywhere else in the world, they tell me).
5. Weather.

Do you know of any other reasons?