After the painstrom and the sol-jam, the team went into rapid experimentation. Within seven weeks it was running a test of what was eventually launched as Mobile Bazaar, a simple text-messagingbased marketplace connecting buyers and sellers. To get there so fast, the team had cleverly faked parts of the product that would have been costly and slow to code and build. These came to be known as “fako backends.” What the user saw looked real, but behind the user interface was a human being-like the wizard of Oz behind the curtain-rather than thousands of lines of code that would have taken months to write.