The subdomain cinyourrc.facebook.com is used for internal technical routing, specifically for "Free Data Access" (zero-rating) that allows users to access basic Facebook services through partnered mobile networks. It also functions as a release candidate (RC) endpoint for testing new features before public release and is recognized in security research as part of Facebook's network infrastructure. Information on how to manage free data access with your provider is available from Bug Bounty Indonesia #4–3. Passive Subdomain Enumeration
This is a scam, do not click links like this. Facebook will NEVER ... http- free.cinyourrc.facebook.com
Tips to keep your account secure * Don't click suspicious links: If you get a suspicious email or text or social media message cla... What is h.facebook.com? Is it a genuine part of ... - Quora The subdomain cinyourrc