This snippet of a podcast by "Hooked" author Nir Eyal speaks to the "almost psychologist" in me. Fascinated by what motivates human behavior, I began my college studies as a psychology major. In the end I realized my strengths were writing and communicating, and I changed majors. It was all helpful, as a good understanding of what makes us tick also makes for effective marketing.
In this segment, Eyal talks about the "user's itch," the internal need that compels someone to click Facebook over Twitter, or post a photo to Instagram rather than Pinterest. It's an excellent reminder to think more deeply about the user experience. Listen to the full podcast here (track #4).