Ask HN: User behavior on Twitter

A long time ago i read an article here about how certain user actions on twitter (favorite, retweet a tweet) could influence an user to follow you. Stupid me didn't see the entire value of it at that time and didn't add a bookmark to it. I'm interested in that article, strategy and algorithms used to implement it. Bottom line, I want to make something similar and i don't have a starting point. Any help is welcome! :)

Cheers!