I joined Twitter Blue after Twitter’s recommendation algorithm source code was released.

Twitter's Recommendation Algorithm Source Code

GitHub: twitter/the-algorithm: Source code for Twitter’s Recommendation Algorithm

Code Showing Twitter Blue Preferential Treatment

// verified accounts
tweetFromVerifiedAccountBoost = params.getTweetFromVerifiedAccountBoost();
tweetFromBlueVerifiedAccountBoost = params.getTweetFromBlueVerifiedAccountBoost();

Source: https://github.com/twitter/the-algorithm/blob/7f90d0ca342b928b479b512ec51ac2c3821f5922/src/java/com/twitter/search/earlybird/search/relevance/LinearScoringParams.java#L260-L262

That’s all from the Gemba, where I subscribed to Twitter Blue due to source code release marketing(?)