Estimate audience reach

Shows Meta's full tree of detailed targeting categories for an ad account, so you can browse options without a keyword. The whole Meta detailed-targeting category tree of one ad account (Meta's `GET /act_{ad_account_id}/targetingbrowse`), as one flat list you can render as a tree. Use it to show what can be targeted without a keyword; use `GET /v1/ads/targeting/search` to find an entry by name. Every node is one of two kinds: - **Selectable entity** (`selectable: true`): an interest, behavior or demographic Meta gives an id. `id` plus `type` is what a targeting spec takes. `interests`, `behaviors` and `industries` ids go in `TargetingSpec.interests`, `behaviors` and `workIndustries` on `POST /v1/ads/create`; every other type goes in `rawTargeting.flexible_spec` under its `type` as the key. `life_events`, `family_statuses` and `income` take objects (`{ "flexible_spec": [{ "life_events": [{ "id": "6017476616183" }] }] }`), while `education_statuses` and `relationship_statuses` take the bare number (`{ "flexible_spec": [{ "education_statuses": [3] }] }`): Meta answers an object there with a 500. - **Organizational node** (`selectable: false`, `id: null`): a category such as `Demographics > Financial > Income` that only groups other nodes and cannot be targeted. A few carry a `type` and have no children (`Schools`, `Employers`, `Job titles`, `Fields of study`, `Undergrad years`): those are open-ended categories Meta only exposes through search (`dimension=workEmployer` / `workPosition` on the search endpoint). `nodeId` identifies a node within this response and `parentNodeId` points at its parent (`null` for the three roots `Demographics`, `Interests`, `Behaviors`). A selectable node's `nodeId` is `{type}:{id}`, because Meta reuses small ids across types (education status 3 and relationship status 3 are different entities). An organizational node's `nodeId` is its full path joined with ` > `. Labels are kept exactly as Meta sends them, including stray leading or trailing spaces, because Meta has sibling nodes that differ only by whitespace. The interests branch is Meta's curated browse list (a few hundred entries), not every interest Meta can target: search finds the long tail. **No pagination.** Meta returns the whole catalog in one response (about 770 nodes) and ignores `limit`, so there is no cursor. Narrow it with `type`, `parentNodeId` and `selectable` instead; they are applied by Zernio. The catalog is cached for an hour per ad account and connection.