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That's how I read it: 21% A/B test, of whom 93% use Optimizely.

I agree, that said, I think it's hard to say the 79% _don't_ A/B test. Could easily be homegrown, or round-robin based, or perhaps it was only included on a specific page.

Yes, especially given the zeitgeist around A/B testing, that seems unlikely.

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