When it came time for Iris Smyles to meet with the publicity people at Houghton Mifflin Harcourt to “do the usual thing of getting blurbs,” as she put it, for her book “Dating Tips for the Unemployed,” the ass-kissing and self-promotion could’ve sent her soul fleeing her body like a shirt ripped from a hanger. Instead, pausing in her consumption of some takeout, she noticed a promotion from the online company that had delivered it, a contest, really — your testimonial here, or something like.