If a profile is locked, only friends can see the full-resolution photos, stories, and posts. However, some methods exist for limited visibility:
Despite these technical barriers, hundreds of websites and apps claim to offer "stalker trackers" or "visitor lists." These are almost universally malicious and follow a predictable pattern: facebook profile viewer
As Facebook continues to evolve and prioritize user security, it's likely that the functionality of profile viewers will change. In the future, we may see: If a profile is locked, only friends can
Many of these "trackers" are loaded with viruses or malware designed to steal personal data from your device. False Data: If a profile is locked