1000 Test Versions All At Once - Now thats different

In this article about Mark Zukerbergs letter to shareholders pre-float, there is a section on the programming methodologies deployed by Facebook. What I like is the "get it out to the users approach as quickly as possible" approach, something I thoroughly agree with. This is taken to a new level at Facebook with upto 1000 different versions of the same feature all being tested at the same time. I closed my Facebook account recently.