Now with an overall pool of some 35,000 users and about 5,000 active readers, the UK's The Pigeonhole engages consumers ahead of a book's release to generate word-of-mouth.
At a pre-fair news conference, Frankfurter Buchmesse officials stress the importance of the freedom to publish and the book industry's role in a politically charged era.
Taking in several historical perspectives, the shortlist for the coveted German Book Prize offers what the jury calls 'the sensuousness of another time, which always evokes ours.'