Optimize Marketing Spend to Maintain ROI, Pinterest to Test Livestreamed Events this Month, TikTok Launches #FactCheckYourFeed to Support Media Literacy, PWAs Are the Next Big Thing for Mobile Experience, World's Largest Crypto Trading Platform Under Investigation by DOJ and IRS: Report, Facebook Tests New Warning Prompts to Stop Users Sharing Articles They Haven't Read, LinkedIn Provides an Overview of Effective Ad Targeting, TikTok Moves to the Next Stage of E-Commerce Testing a Key Shift for the Platform