dead right. whats works for someone won't necessary work for anyone else - you MUST A/B test. i increased my ROI week by week with a/b testing and in my mind no

dead right. whats works for someone won't necessary work for anyone else - you MUST A/B test. i increased my ROI week by week with a/b testing and in my mind now if you not doing it then it's a crapshoot. But there are things that are (asymptotically) absolute truths in marketing and i loved the article. i bookmarked the site which i don't do very often