X's Open-Source Algorithm Reveals Why Replies Outweigh Likes by 27x

X's open-sourced ranking algorithm assigns engagement weights that heavily favor replies over likes and retweets, with a reply answered by the original poster scoring 150 times higher than a like. These weights are designed to maximize time spent on the app, as back-and-forth conversations keep users engaged far longer than passive scrolling. For small accounts with limited followers, replying under larger accounts is algorithmically more effective than posting original content, since it borrows existing audience distribution. X has also introduced AI-based content quality scoring via Grok, penalizing recycled and clickbait posts in both payouts and reach, rewarding original and timely content instead. Understanding the algorithm as a time-on-app optimization tool, rather than following generic posting advice, offers a more strategic approach to growing an audience on the platform.