Here’s a clear, informative text on the topic:
You may have come across websites, apps, or browser extensions promising to let you view Facebook profiles, stories, or messages anonymously. They often use enticing phrases like “see who viewed your profile” or “watch stories without being seen.” But before you click, here’s what you need to know: anonym facebook viewer
Most of these tools ask for your Facebook login credentials, permission to install software, or access to your browser data. This can lead to account theft, identity fraud, or malware infections. Here’s a clear, informative text on the topic:
If you want to keep your activity low-key on Facebook, consider adjusting your own privacy settings, using a secondary account (within FB’s rules), or simply not interacting with content you don’t want to be associated with. If you want to keep your activity low-key
Using such tools can result in temporary or permanent account suspension.
I understand you're looking for information about an "anonymous Facebook viewer" — a tool or service that claims to let you view Facebook profiles, stories, or posts without the other person knowing.