There is a threat to humanity in current media platforms.
I agree.
They are monopoly-owned by a few, which control the news feed. They decide whats a hot topic, they decide whats the narrative, and they decide what to censor.
The problems of media aren't monopolies anymore. Its the same issue that you have with politicians. You get the leaders that the society produces. So you get the reporters and media houses that the society produces.
WHAT IF, similar to Bitcoin, we could create an anonymous-founded platform where people will be able to vote-rate news articles, can add news as rebuttals, make comments... to already existing news. (WSJ, NYT, Le monde...etc).
Imagine like a consolidated site of news coming from different platform, and all being scrutinized by the community. Maybe we could create a veracity logo if has 4 stars or more.
Thinking on having probably a dashboard of news which have link previews (similar to what Twitter or Whatsapp does when pasted an URL).
as user you would go in everyday and filter news by veracity, rating, rebuttals and subjects or hashtags.
Imagine we could do the same for the journalists..
This is truly a big problem that needs to be solved. Being as it is for the greater good and not necessarily for profit-motive, there is no reason to believe that something like this can attract the money and talent pool needed to fulfill this. For example, nothing stops someone from training an AI to differentiate between fake videos, old videos being spread as new events, photoshopped images etc. These are just the very basic and recognizable methods. Nobody is spending on the tech to do that. The much harder issue that you propose to address using something of a blockchain is of trolls and social engineering with paid bots and accounts. That can never be done because a bunch of people and parties whose full-time job is to create narratives will always succeed in doing so.
You need IoT level of solutions where everything from the recording to the production of a media report is monitored and recorded for correctness of procedure using a blockchain. All such systems can be imagined and even implemented. But why would someone do that when they are already earning enough by creating narratives and manipulating public opinion.
Despite the pessimism expressed in my reply and by other posters, I still feel that creating a truly verifiable source of news is indeed possible. All it needs is money. Maybe the Bitcoin rich would do something about it. But judging how wealth corrupts almost everyone, we'd be foolish to pin such hopes and anybody else but our own selves.