I agree that the amount of "blatant lies" adhered to by large chunks of American citizens is causing/exacerbating our socio-political issues. But I also agree that changing social media is probably not enough. American politics has become an arms race of increasingly polarizing ideologies none of which are particularly appealing/helpful to normal people.

Shared primary ballots is a good start, but it seems like the most meaningful change to our political system would be implementing a system of ranked voting (https://en.wikipedia.org/wiki/Ranked_voting). Among other things, that would help break the two-party nightmare cased by first-past-the-post voting.