Someone on HN made a site called “how truthful”. I thought that was a good idea too. Two people create one to debate a topic and they drill down into each fact until they get to something they agree on.

I can’t seem to find it now. It seemed like a good idea.

Edit: found it https://news.ycombinator.com/item?id=21687403. (The video probably explains it best https://m.youtube.com/watch?feature=youtu.be&v=PXvU1h44jVw)