The “Who else sees it” column on Settings → Privacy answers this per kind of data, and the full policy is linked from the same screen.
That screen is the authoritative answer, which is why this article points at it instead of paraphrasing it — a paraphrase can go out of date, and the screen cannot.
Where to read the actual answer
- Open Settings → Privacy.
- Find the table headed “What is held, and for how long”.
- Read the Who else sees it column for each kind of data.
That screen is generated from how the site is configured, so it cannot drift out of date the way a written summary can. The full policy is linked from the same place.
For a formal question, use the privacy contact named under “If you are not happy” rather than a support ticket.