The only "profile viewers" that work are the ones Facebook itself provides: log in, send a friend request, or accept that some profiles are meant to be private.
A: The only 100% working viewer is the official Facebook website or app, which requires an account.
By [Author Name] | Cybersecurity & Social Media Analyst Introduction: The Curiosity That Hackers Exploit We have all been there. You receive a notification that someone viewed your story, but their name is blurred. You want to check an ex-partner’s new photos, see what a competitor is posting, or verify a friend's public profile—but you don’t have a Facebook account. Or, perhaps you have one, but you don't want to leave a digital footprint by logging in.