“The book absolutely delivers on this premise, serving as an excellent primer for the uninitiated, while carrying out a useful analysis of its sociotechnical features that allows one to position tumblr within its historic role in the social media platforms landscape alongside the more popular Facebook and Twitter. … Through flowing writing, humorous anecdotes, and extensive signposting, the authors constantly unpack yet another aspect of the platform, often grounding it in specific spaces and/or periods, yet without losing sense of the broader picture. … It is a timely, interesting, and profoundly enjoyable volume on an object which is oft overlooked in platform and social media research yet has great bearings on both fields.”Internet Histories