Building in public got popular as a way to get followers. We use it for a completely different reason: to make it harder to quit.
The audience is irrelevant
You don't need 10,000 followers for build in public to work. Even one person watching changes your behaviour.
How Quild uses it
Weekly updates posted in the community — not for clout, for record. The question is always: "what changed this week?"
What to actually post
What you shipped (with a link if possible). What broke. What you changed your mind about. NOT: what you're going to do next week.
The side effect
After 4 weeks of build in public, your taste improves. You start making decisions you'd be comfortable explaining.
Post the update. Even if nobody reads it. Especially if nobody reads it.
