You do not always need a Facebook account to see basic information, but your access is strictly limited to what the user and Facebook allow publicly. Search Engine Caching
If you are trying to find someone online safely, let me know you are looking for (like an old classmate or a local business) or what country they are located in. I can guide you through the best, safest OSINT (open-source intelligence) search techniques available. facebook profile viewer no account link
Facebook doesn't let people track who views their profile. Third-party apps also can't provide this functionality. You do not always need a Facebook account