I was looking for a good Facebook post viewer just to understand if they actually work, but could not find any information. thought to ask here. It’s just to understand whether these actually work.
No, not really. 
Facebook has locked things down quite a bit. Those “private profile viewer” websites you see all over Google? They are scams, full stop. I tested like four of them just out of curiosity and every single one either asked me to do a survey, download an app, or verify my phone number. None of them actually showed me anything. They just keep looping you around. Facebook’s privacy settings are set at the account level, so if someone puts their profile on private, the only things visible to non-friends are their name, profile picture, cover photo, and whatever they choose to make public. That’s it. No secret backdoor exists for regular users. Save yourself the time and do not fall for those tools.
##Can You Actually View a Private Facebook Profile?##
##The Short Technical Answer##
Facebook uses server-side privacy controls, meaning what you can see is decided by Facebook’s servers before the page even loads on your browser. So no browser trick or third-party tool can pull data that the server refuses to send.
##What Is Actually Visible Without Being Friends##
Without sending a friend request, here is what any person can see on a private profile:
- Profile picture and cover photo
- Name and username
- Mutual friends (if any)
- Any posts the person has set to “Public”
##Why Those Viewer Tools Do Not Work##
Those websites claiming to show private profiles are not connected to Facebook’s API in any real way. Facebook shut down unrestricted API access years ago. Any site promising otherwise is either phishing for your credentials or running a survey scam to make ad revenue off your clicks.
##What You CAN Try Legally##
If you need to see someone’s posts and have their consent, the cleanest way is simply sending a friend request or asking them to adjust their privacy settings for specific posts. There is no technical workaround that actually functions.
bro same 
I spent like two hours trying to figure this out and every site I clicked was just bait. One of them literally asked for my Facebook login to authenticate before showing results. RED FLAG obviously. Do not ever put your login into a third party site like that, you will get your account phished so fast. The whole private viewer thing is basically a myth at this point. Facebook does not expose that data. Period.