A while ago I read that the Huffington Post AB tests headline titles, presumably other big publishers do the same thing: http://www.niemanlab.org/2009/10/how-t

A while ago I read that the Huffington Post AB tests headline titles, presumably other big publishers do the same thing: http://www.niemanlab.org/2009/10/how-the-huffington-post-uses-real-time-testing-to-write-better-headlines/ http://www.niemanlab.org/2009/10/how-the-huffington-post-use...