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social-measurement-loop

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Use when the user asks to "run the weekly social readout", "which denominator does our engagement rate use", or "which posts won this week and what changes next cycle"; produces the organic-social metric dictionary (every rate names its denominator — ERR engagement-by-reach vs ERI by-impressions vs ER-by-follower — locked across periods), median-not-mean per-post rollups with organic and boosted separated, EMV as labeled exec-translation only (never inside any score), an attributed CHAOSS/Orbit-style community-health readout with employees excluded, and the best/worst-performer write-back the next calendar cycle consumes. Not for dollar-ROI math or the ECHO profile result gate verdict — use roi-calculator and social-quality-auditor. 社媒周报/互动率分母/指标字典/复盘回写

social/observe/social-measurement-loop/SKILL.md

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# Social Measurement Loop

The weekly organic-social readback loop — the sibling of [paid-measurement-loop](../../../ad/scale/paid-measurement-loop/SKILL.md) for unpaid channels. It owns the measurement-integrity core of the ECHO **O** lever and feeds five O sub-items in [echo-benchmark.md](../../../references/echo-benchmark.md): declared period-stable denominators (the upstream of the **ECHO-O1** veto), median-not-mean per-post rollups with organic and boosted separated, EMV excluded from any score, employee-excluded community-health metrics, and learnings written back to the next cycle. It owns the O lever's dictionary and loop but **never computes the ECHO profile result** — only [social-quality-auditor](../../host/social-quality-auditor/SKILL.md) scores ECHO and runs vetoes.

**Scope guard**: this skill produces the metric dictionary, the period readout, and the write-back list only. It does NOT issue the gate verdict or run ECHO-O1 ([social-quality-auditor](../../host/social-quality-auditor/SKILL.md)), compute dollar ROI or revenue-per-post ([roi-calculator](../../../influencer/report/roi-calculator/SKILL.md)), declare the dark-social estimation method ([dark-social-attributor](../dark-social-attributor/SKILL.md)), track share of voice ([share-of-voice-tracker](../share-of-voice-tracker/SKILL.md)), or roll up across disciplines ([performance-analyzer](../../../influencer/report/performance-analyzer/SKILL.md)). Registry-grade facts it surfaces (cadence drift, channel-state observations) go to `memory/events/channels.ndjson` via an authorized `operation: propose` request to `registry-events.py` only — [channel-registry](../../../protocol/channel-registry/SKILL.md) is the sole writer of `memory/channels/`.

## Quick Start

```
Run the weekly social readout for the week of 2026-06-29 — here are the Instagram and 小红书 analytics exports plus GA4.
```

```
Build our metric dictionary: which denominator does each engagement rate use per channel, and lock it for future periods.
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