I would like to see something that is less focussed on social media and more on building something together like Wikipedia. One thing that comes to mind would be mapping out all political statements along with arguments and evidence to support or falsify them and the relationships between them (e.g. “if you believe x is a big problem in society and you believe y is the perfect form of government then you must believe y solves x”).
A lot of our political discussions seem quite repetitive and go in circles because each argument is presented in a very shallow way. Something to counteract that would be welcome and I think it could work quite well in a federated way since people with different political views would probably want to contribute the supporting and that falsifying sides for each statement.