- a product needs retention
- a product needs to become better as more people use it. if more people use it, it becomes better for me. i will try to get more people in.
- a product needs to reach a stage where if some users perform some actions, I will get notified of those things. self-perpetuating loops.
- they do something. i get notification. makes me go through a loop again. because I went through a loop again, someone else will also be triggered and go through a loop again.