Yeah, such a system would be great. A bit like Google Scholar. Papers are indexed and you can access the references easily. And you would be able to comment an

Yeah, such a system would be great. A bit like Google Scholar. Papers are indexed and you can access the references easily. And you would be able to comment and review certain lines. Everyone could add notes that certain equations are wrong, etc. In best case authors would engage in the discussion too. But obviously this won't work because some papers are behind paywalls :/