I think that's the spirit of the post, that building persuasive systems is moving/has moved into the real world in a principled way. Disclaimer: I work with th

I think that's the spirit of the post, that building persuasive systems is moving/has moved into the real world in a principled way. Disclaimer: I work with the author, and it's suprised me how much of a 'science' it really is (hypotheses can be tested, and the results can be measured and improved)