Semi-automating content optimization:

So here’s something devilishly brilliant: The Huffington Post applies A/B testing to some of its headlines. Readers are randomly shown one of two headlines for the same story. After five minutes, which is enough time for such a high-traffic site, the version with the most clicks becomes the wood that everyone sees.

via How The Huffington Post uses real-time testing to write better headlines » Nieman Journalism Lab.