Comment by DeadSuperHero

We just sat down and wrote a review about NeoDB, and it's a fascinating project. In a nutshell, it's a federated user review system for cultural works. Not only does it log books, but also movies, tv shows, video games, board games, music, podcasts, and more. The project is pursuing some really interesting ideas through data integrations, and the ability to import archives from other services to easily rebuild your social graph.