The most dangerous variant asks you to download a "Profile Viewer Tool.exe" (for Windows) or a ".apk" (for Android). These files are almost always (like RedLine or Vidar). Once installed, they:
Facebook does not allow users to track who views their profile, and third-party apps claiming to offer this feature are likely scams. Legitimate ways to browse public Facebook profiles without an account include using external search engines, direct URL access, and bypassing login prompts on public videos. For more details, visit Facebook Help Center . Who views your Facebook profile | Facebook Help Center Facebook Profile Viewer No Account
Any tool asking for your own Facebook password to "authenticate the search" is a phishing attempt designed to steal your credentials. The most dangerous variant asks you to download