Seems to me that’s a viable answer. How can we test an algorithm like Google’s ranking though? We can’t feed it consistent data like in a software test. It relies on too much information, and what we know about it indicates we can’t extract it out to test against it—except for results in the real world.

Not to mention Facebook’s are even more difficult. Tangentially related, remember when you could use “View As” on your profile page to see what your profile looked like to others? It doesn’t work anymore, only works for Public and Yourself; you can no longer choose the person to view as.

It’d be great to test these algorithms. We can’t. They need to be designed and instrumented so this is possible.