Why Do Some Substack Notes Go Viral?

I've recently noticed something interesting: some Substack Notes from new or low-follower accounts seem to go viral—even when the content feels pretty basic.

Does anyone know how the Substack algorithm works? Is it just about engagement (likes, shares, comments), or are there other factors at play?

I'm curious if it's purely luck, timing, or if there are specific strategies that increase visibility.

Would love to hear your insights or experiences.