There's notabug.io, which is a federated link aggregator/discussion platform, has optional anonymity, and uses a PoW voting system (which allows for anonymous v

There's notabug.io, which is a federated link aggregator/discussion platform, has optional anonymity, and uses a PoW voting system (which allows for anonymous votes). There's some interesting elements to the design, such as peers not needing to be in total agreement about the state of the world, so content can be replicated or moderated/censored/blocked at the whim of each peer, and each peer can build their own unique features on top of the same datasets (eg, different tagging or voting systems on different peers, while still working with the same underlying content).