I covered also the subject in a previous post and I think it's a well thought idea. The fact that media manipulates almost anything is not a mystery anymore, but when you come up with a website that points precisely at these manipulative ones and make the media environment more transparent you kind of give the power to the people back as the media is considered one of the most influential powers in a state.
You went even further with this idea by proposing a blockchain based and decentralized site that might be more than just a classic web site for sharing opinions on bloggers, editors and other journalists. Why not suggest to Elon Musk directly? He seems pretty open to this kind of interaction on twitter.
For more details feel free to read my post on this topic:
https://steemit.com/busy/@acesontop/inspired-by-lenin-elon-musk-is-planning-to-create-his-own-pravda-and-rate-media-publications

I promise it's not long and you won't get bored :)