So as expected, there is exactly nothing that favors posters from one side of the political spectrum. I don't expect that this article will do anything to calm down those who are convinced otherwise though.
Well written article, from an engineer's perspective.
Ranking is achieved with a ~48M parameter neural network that is continuously trained on Tweet interactions to optimize for positive engagement (e.g. Likes, Retweets, and Replies). This ranking mechanism takes into account thousands of features and outputs ten labels to give each Tweet a score, where each label represents the probability of an engagement. We rank the Tweets from these scores.
This is basically the ultimate black box, so I don't think you can really conclude anything like this either way.
Well written article, from an engineer's perspective.