A few years back, a writer friend who worked at a prominent blog explained to me that her employer's sensationalist, runon headlines were crafted with the help of a cutting-edge A/B testing system. Each article would go live with multiple versions of the same headline; the version to draw the most clicks would become the canonical version. This, I thought, this is the future: algorithms drawing on user feedback to adjust our texts on the fly for maximum impact.
In 2012, I was among the millions of Americans who noticed that Barack Obama and his campaign staff had started writing some kinda weird messages to me. They'd arrive with subject lines like "Hey" or "Would Love to Meet You." They got talked about at dinner parties. After Election Day, explanations were offered in the press. These weren't the brainchild of a mad creative subject line marketing genius. No, they were carefully tested beforehand among multiple variations sent to smaller groups of supporters, and only the most successful versions made it to the full campaign email list. Obama's campaign raised hundreds of millions of dollars through email direct marketing.