Is the NY Post actually a news paper?
I was under the impression that for the longest times (as in hundreds of years) the NY Post was not actually reporting news but was mostly a tabloid and slandering platform for the owners of the NY Post only interested in facts that will cause shock and slander or can be bent to cause shock and slander. (Which if I understood correctly started with A. Hamilton at the end of the 18th century.)
If I own the vast majority of the means and wherewithal to disseminate information, I get to control what information gets disseminated. And If I want to label any other organization that disagrees with my agenda as a tabloid, how long would it take for the majority of the consumers of my information to reach the conclusion that the other organization is a tabloid?
A significant portion of book burnings in the past were promoted if not started by the majority that was in control of getting information out to people. Sometimes that was religion, sometimes it was business, sometimes it was government. It was never right. It doesn't matter to me that publishers (and yes, I believe they are publishers) like FB, Instagram, Twitter, Youtube, and now Zoom are not under the auspices of the 1st Amendment. What they are doing is wrong. The Bill of Rights exist to constrain the government in any future attempt to restrict our rights. But just because it does not hinder private organizations or individuals, that does not mean it shouldn't be our job to constrain those that would try to do that outside of government. It doesn't matter if they are doing it to conservatives, terrorists, liberals, socialists, communists, or knitters, it's wrong.
The only way to mitigate the risk of disinformation is with accurate information. Flag the post as you like, but have the courage of your convictions and present a counter-point. And no, a simple downvote without a comment is and should not be sufficient. If you disagree with someone having the inherent right to communicate via the modern equivalent of the community square, you are a coward and part of the problem.