Who gets considered?
Thunder, Phoenix, SimClusters, caches, and optional sources create the feasible set.
What actually decidesyour For You feed?
Not one model. A chain of supply, prediction, policy, safety, and product decisions.
Follow the pencil. Every line below maps to public source.
On a small screen, swipe sideways to inspect the whole board.
One request. Six different decisions.
What is the viewer likely to do?
Phoenix predicts many positive and negative actions independently for each candidate.
What is each action worth?
Home Mixer applies public, configurable action weights to produce utility.
Does the slate need balance?
Cold-start promotion, author attenuation, OON policy, and optional DPP reshape membership.
May it be shown?
Visibility rules evaluate author state, viewer relationships, media, labels, and legal policy.
Where does it land?
Ads, Who to Follow, prompts, surveys, and frames alter the final sequence.
Try a slice of the ranking equation.
Move predicted probabilities. This sandbox uses six exact public weights and shows their partial raw utility. Every unlisted prediction is held at zero.
partial raw utility
Positive, before downstream policy.
A high score cannot overrule a safety drop.
Phoenix estimates behavior. Visibility Filtering answers a separate question: may this post be shown to this viewer in this surface?
- Allow
- Keep the post normally.
- Interstitial
- Keep it, but render a warning or cover elsewhere.
- Drop
- Remove it from the candidate slate.
What the public code proves, and what it does not.
Established from source
Still deployment-dependent
Not included upstream
Pipeline order and concurrency
Live feature-switch allocation
Production data and checkpoints
Published action weights
Whether VM Ranker's DPP flag is on
Some safety rules and Grox prompts
Phoenix and SimClusters structure
Dynamic thresholds and endpoints
Exact live serving topology
The board is the map. The report is the evidence.
The complete audit includes the full action-weight table, DPP mathematics, SimClusters graph construction, visibility rule families, failure semantics, change census, and 43 exact-SHA links.