Instagram gives you 150 characters to convince a visitor to convert. That's the bio. Plus one link. Plus one profile image. Nine signals in total decide whether your profile does any work. Bio hook, link-in-bio, category badge, contact button, profile photo, post count, handle keyword fit, and whether you use line breaks and emoji markers for scannability.
Most business profiles fail on three or four. Empty bio. Generic avatar. No link-in-bio (or the link is a raw Linktree with no context). No category badge. The Instagram Business Profile Audit scrapes the public preview Instagram still serves without login, scores each signal, and emits a rewrite prompt with your character count already applied.
The public preview won't see any follower-only data (story highlights, reels, DM button). For those, the audit output includes a manual checklist you run inside the app. But the nine things that matter to a first-time visitor arriving from Google search. The audit catches all of them automatically.
For the methodology side, Chapter 11 of The $20 Dollar Agency walks through the social playbook across all platforms. Chapter 50 of The $100 Network. Social Distribution and Content Repurposing. Covers how Instagram fits into a multi-platform content workflow.