Component index

Builds For You. Owns pipeline stages, scoring weights, and calls out to Thunder, Phoenix, SimClusters, VF, and ads.

Framework Home Mixer sits on. Source, hydrator, filter, scorer, selector, side-effect stages. Parallel where it can.

In-memory store of recent posts from accounts the viewer follows. The in-network candidate source.

Two-tower model. Viewer history embedding vs a semantic-ID post index. Returns nearest out-of-network posts.

Clusters accounts and posts by who engages with what, then retrieves by cluster overlap.

Maintains the retrieval index as post events arrive.

Event layer that picks an index shard after consulting visibility filtering.

Transformer that predicts per-action probabilities. Candidates cannot attend to each other. JAX train, Rust serve.

Determinantal point process over embeddings. Trades a little score for less similarity between neighbors.

Publish-time classifiers for spam, adult, and violent media, plus numeric text/image representations. Prompts are not published.

Serves image and video models: adult, violence, hateful symbols, subject matter, known-media match.

Trains the image/text embedding model the media classifiers consume.

Offline account labels from how others respond: blocks and reports relative to favorites, plus spam and adult flags.

Sequence model over an account's actions. Looks for inauthentic or abusive behavior over time.

PageRank over the follow graph and engagement edges. One reputation number per account.

Per (viewer, post): allow, interstitial, or drop. First matching drop wins. Separate rules for Home vs recommendations.

Applies label rules to live events. Embeds Botmaker as its engine.

Rule language, compiler, and runtime. Scarecrow loads bots from botmaker-rules/.

Acts on model scores rather than events: label, challenge, or suspend.

Rolls post labels up onto the account.

Daily jobs that assemble the public label report: aggregates for an account and its posts over a month.