A post given a latitude and longitude becomes LocalGeo: its position is rounded to two decimals (about a kilometre) and stored as a 2dsphere point, its radius clamped to 1-50 km, and it is local only - no Create, no delivery, no outbox, never in the Mastodon API or on a profile page. /clientapi/post/nearby takes the viewer's position for the query only (it is neither stored nor logged), runs $geoNear and keeps posts within each post's own radius, minus authors the viewer blocks or mutes. A located post cannot be direct or in a group. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_012CzABvBkbcFqoHdmi8b9WB