Photo viewer terms
Photo and image searches are usually public-media searches
Facebook photo viewer, facebook photos viewer, facebook photo viewer online, facebook picture viewer, facebook pictures viewer, facebook image viewer, facebook images viewer, fb photo viewer, and facebook photo view all point toward public image viewing intent.
Photo viewer terms usually describe image-focused intent. Use the facebook viewer for public profile images and public photo links, then review the result shown on the same page.
Posts and pages
Post and page links depend on audience settings
Facebook post viewer, facebook posts viewer, facebook post viewer online, facebook post viewer anonymous, facebook page viewer, facebook page viewer online, facebook page viewer anonymous, and anonymous facebook page viewer are better answered with page and post availability context.
Post and page viewer searches can include business pages, public posts, and profile updates. Availability depends on the link, audience settings, age restrictions, and platform rules.
Video links
Use the right page for video media
Facebook video viewer, fb video viewer, facebook media viewer, public facebook viewer, and facebook web viewer can overlap with video links or public media links.
For video links, use the video page instead of the facebook viewer. Separating the tools keeps each page simpler and makes it clearer which type of public media is being checked.