> There's also a lot of people working on this so stuff changes fast and often. Think about all of Facebook's different products vyying for attention in the fee

> There's also a lot of people working on this so stuff changes fast and often. Think about all of Facebook's different products vyying for attention in the feed. Think of all the PMs with agendas who want their product in the feed in certain ways. If you can't maintain a complete understanding of the process, you are playing a guessing game. This isn't some special magical FB-centric problem.