Now, if we have a look at this image it shows us a little about how google makes an algorithm change. It usually starts with an idea from one of their Engineers, then the idea gets implemented on a test page. From that the test page and the current serp page is sent to a group of testers. These testers are not employed by google and are all over the world and of different backgrounds, etc. If google get some positive feedback on the test page it moves to the next step of a live experiment...this is where a small percentage of the population get to see the test page. And this is what is happening with adult right now...its in this stage. 99.9999% of people are still getting the regular serps...but this very very small test group of the population are being tested on serps with little porn. If the feedback is what google is looking for, it eventually goes live, United States first. Panda is a learning machine algo...so it will taker several years. So the change to porn in the serps will take a number of years, but its already happening. There is a slow phase out..a reduction lets say.