Social Books, which let users leave public comments on particular passages and comment on passages selected by others, became Rethink Books and then faltered. Push Pop Press, whose avowed aim was to reimagine the book by mixing text, images, audio, video and interactive graphics, was acquired by Facebook in 2011 and heard from no more. Copia, another highly publicized social reading platform, changed its business model to become a classroom learning tool.
The latest to stumble is Small Demons, which explores the interrelationship among books. Users who were struck by the Ziegfeld Follies in “The Great Gatsby,” for instance, could follow a link to the dancers’ appearance in 67 other books. Small Demons said it would close this month without a new investor.