This integration pushes the Optimizely experiments and variations a visitor has seen on your site into Google Tag Managers dataLayer object. This then allows you to use this information in your Tags in Google Tag Manager.
Watch the 4-minute video walkthrough of how to set things up:
Feel free to check out written instructions here:
https://docs.google.com/document/d/1dvd_38Qa_z2fSOV6Sm2z_ScrK0QQsstm9njufJNSFA8/edit
Send me your feedback, I'm eager to learn how this integration could be improved!