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Here is a bookmarklet you can use to browse or spy on an Optimizely customer's experiments!

javascript:window.jQuery && jQuery.getScript("//dl.dropboxusercontent.com/s/ci08683w66ud4s0/optimizelyspytool.js");

(highlight and drag this to your bookmark bar on your browser .. the older version broke on certain browser due to MIME type)

Since all of their experiment code is made publicly available in the javascript library, rather than server-side decisioning, it's all waiting to be browsed.

List of Optimizely customers: https://search.nerdydata.com/search/#!/searchTerm=cdn.optimizely.com/js/searchPage=1/sort=pop

Source: http://www.reddit.com/r/webdev/comments/25obly/optimizely_is_vulnerable_to_spies/

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Looks like Optimizely has now partially fixed this (June 5th, 2014): http://growthhackers.com/3-new-optimizely-settings-to-give-you-more-control/

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