<p>We are active with our mobile devices; we play games, watch films, listen to music, check social media, and tap screens and keyboards while we are on the move. In<i>Mood and Mobility</i>, Richard Coyne argues that not only do we communicate, process information, and entertain ourselves through devices and social media; we also receive, modify, intensify, and transmit moods. Designers, practitioners, educators, researchers, and users should pay more attention to the moods created around our smartphones, tablets, and laptops.</p><p>Drawing on research from a range of disciplines, including experimental psychology, phenomenology, cultural theory, and architecture, Coyne shows that users of social media are not simply passive receivers of moods; they are complicit in making moods. Devoting each chapter to a particular mood -- from curiosity and pleasure to anxiety and melancholy -- Coyne shows that devices and technologies do affect people's moods, although not always directly. He shows that mood effects are transitional; different moods suit different occasions, and derive character from emotional shifts. Furthermore, moods are active; we enlist all the resources of human sociability to create moods. And finally, the discourse about mood is deeply reflexive; in a kind of meta-moodiness, we talk about our moods and have feelings about them. Mood, in Coyne's distinctive telling, provides a new way to look at the ever-changing world of ubiquitous digital technologies.</p>