Mack Grenfell

Hey again, I'm Mack.

I build Trakkr and Byword, and share what's working.

2026Micro agents belong in the interfaceProduct2024Claim detection and fact checking for AI SEOAI & SEO2023Building Long-Tail Keyword Lists for Programmatic SEOAI & SEO2021Conversion Lift Tests are Dead; Transitioning to Geo-ExperimentsMeasurementWhat if Performance Advertising isn't Just an Analytics Scam?MeasurementBuilding 2,000 Unique SEO Pages with GPT-3AI & SEOValidating paid search ideas with calculusMeasurementDear Facebook Advertisers, Stop Running Traffic CampaignsAdvertisingHow did Uber waste so much ad money?Advertising2020Facebook's Ad Targeting is Inaccurate - Does It Matter?AdvertisingWhat can we expect from Trump's 2020 Facebook Ads?PlatformsInteractive Forecaster: What impact will iOS 14 have on ad prices?MeasurementWhat if the advertising world were more competitive?AdvertisingMarketing CPAs, ExplainedMeasurementIf You Want to Design Effective Ads, Learn to Play BattleshipsMeasurementPredicting Ad Price Growth with Earnings ReportsMeasurement15 Graphs Which Show How Coronavirus Is Changing What We Search ForMeasurementOne Piece of Calculus That Can Change the Way You AdvertiseMeasurementFixing Dark Patterns: Making Google Search Ads Visible AgainAdvertisingBlack Hat PPC: How Does Referral Code Fraud Work?AdvertisingWhat will political advertising look like in the 2020 election?Platforms2019Banning Micro-Targeting Won’t Solve Facebook’s Political Ads DilemmaPlatformsMarginal CPAs, ExplainedMeasurementFacebook Scraping, Still a Privacy DisasterPlatformsTikTok, and the Evolution of Meme CulturePlatformsWhat most of us get wrong about measuring marketingMeasurementBattle of the Bots: How Market Makers Fight It Out on Crypto ExchangesPlatforms