This page aggregates measured, corroborated evidence: donors' iPhones recorded apps contacting this domain, every claim below was reported by separate accepted donations and published under a human verdict (later rows for an approved app inherit its verdict). A contact is a measurement, not an accusation — it does not show what data was sent.
external-bos5-1.xx.fbcdn.net
classified as cdn · 2
What our research panel found AI-drafted · human-reviewed
We ask several independent AI models the same question and publish their answers separately — cross-vendor agreement is evidence against fabrication, and disagreement is worth seeing. 3 of 3 models answered, overall confidence high. A human reviewed this domain's claims before anything here published.
Anthropic Claude — cdn
fbcdn.net is Meta's content delivery domain, and the 'external-bos5-1.xx' hostname pattern is characteristic of Facebook's media/image proxy infrastructure; since the app is Facebook itself, this is first-party CDN traffic. Serving app content from the vendor's own CDN implies no data flow beyond the app's already extensive declared collection, so nothing here appears undisclosed.
OpenAI — cdn
The fbcdn.net hostname appears to be a Facebook content-delivery domain, though no owner is provided in the data. A CDN contact alone does not establish a data flow beyond Facebook's extensive declared collection and sharing.
Google Gemini — cdn
The domain fbcdn.net is Meta's official Content Delivery Network used to host and deliver media content for Facebook. As first-party network infrastructure, contacting it is expected and does not represent undisclosed tracking.
Apps measured contacting this domain
| App | Label gap | Donations | Contacts | Seen |
|---|---|---|---|---|
| — | 3 | 3 | 2026-07-30 |
The corpus grows one report at a time: donate your App Privacy Report — anonymous by design.
Think something here is wrong?
Evidence and research improve when people push back. Tell us what to re-check — a misattributed domain, an outdated classification, a claim about your own app — and a human will review it. Responses can take up to 30 days.