Posted August 27, 2008 10:07 am by with 12 comments

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Yesterday, we talked about the importance of A/B and multivariate testing. Google offers Website Optimizer (for free) and now we learn just how much the search engine eats its own dog food.

Here’s an A/B experiment that Google has conducted. See if you can spot the difference.

Page 1:

Page 2:

Yeah, I didn’t spot it either, but apparently there is slightly more white space around the first listing, in page 1.

Should you be that granular with your A/B testing? Maybe not, but Google explains just how subtly it’s messing with your mind testing your preferences each day.