Facebook starts over PHP or JAVA?

Question

I'm a business guy, and would like to understand some of the differences between these two technologies when they apply directly to Facebook, and the 6 points below.

If Facebook were to start over what should it use PHP or JAVA? Why?

Special considerations:

1. Scaling
2. Development speed
3. Maintainability
4. Development tools
5. Development costs
6. 3rd party applications
7. Security
8. Deployment speed

Answer 1

according to "considerations": I prefer ASP.NET :)