Platforms use different URL structures
Instagram separates Reels from standard posts and other media types. Facebook has general video and Reel-specific intent. Pinterest Video Pins use their own Pin structure. These differences matter when interpreting a link and planning a verified processing workflow.
These public-link pages do not request an Instagram, Facebook or Pinterest password, OTP, login code or session cookie. Private, deleted or otherwise inaccessible sources are outside the supported scope.