Duolingos Master Growth Hacker

Standard

http://firstround.com/review/the-tenets-of-a-b-testing-from-duolingos-master-growth-hacker/

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Facebook Custom Audience #hack

Standard

Run a video campaign targeting your interest and build a custom audiences out of that and then a Lookalike Audience. You can built a high value Custom Audience with the video engagement feature by selecting the option of people who’ve seen 95% of your video.