We all know Google does a lot of testing, in fact, I probably only cover less than 5% of the tests people email or send me that Google is running. I see tons and tons of UI tests, feature tests, color changes...
Source: Seo Round Table
Originally posted 1970-01-01 00:00:00.
Original article: Google: 1,653 Search Launches With 9,800 Live Experiments & 130,336 Search Quality Tests.