The upper the rank the higher is the chance of that person observing your tweet and, if interested, retweeting it. If you'd like to find out about the algorithm Then you can certainly check out the manual to the Twitter algorithm by Twitter them selves. Just do a Google lookup https://beauuneth.goabroadblog.com/31110297/the-smart-trick-of-copyright-twitter-retweets-that-no-one-is-discussing