I think the trolls will obviously come out to attack this but it seems like a nice extra data point from sites. They aren't obligated to show the data, they could just whitelist sites that they believe are 100% not trolls and then consider other sources based on a history of correctness or human verification. Imagine if they just added the top 10 news sites as valid sources. Then I bet some site like Snopes would pop up as valid because they had a history of agreement with some credible source. It's like Pagerank with trust instead of inbound links.