Karen X Cheng @karenxcheng Karen X Cheng is the founder of Butterbar, a video marketing agency with over 500 million views. 3 Common Video Marketing Mistakes to Avoid Convergent TV By Karen X Cheng April 7, 2019 Every brand needs its own unique strategy. Editing Tweaks That Can Boost Your Video’s Performance on Facebook Convergent TV By Karen X Cheng April 16, 2018 Optimization rules are different on the social platform.