^ using social media as trustworthy news source is troubling IMHO. That could only work if social media was under the same legal regulation as press is.
But user ranking is basically FB saying "no, no. We don't do news, that's not our business. Sign waiver here"
I would very much say: any form of social media and news should not be mixed. Social media is basically attention whoring for everyone these days, truth or value does not matter much in that regard.
http://fortune.com/2017/09/08/facebook-twitter-snap-news/