"Partisan propaganda" isnt the largest issue, even if you find support of it. Fact-checkers just cant scale to the meet the production of news per day. Not possible. Not even with 10 trusted Snopes-like organizations. Snopes produced 830 stories in 2016 under their "News" topic. Thats 2 stories a day. CNN produced over 35,000 stories last year... then there is NYT, HuffPo, WaPo, Fox, MSNBC, Hill.........