Immediately change your Facebook password, enable two-factor authentication, and check your active login sessions under Settings > Security and Login > Where You’re Logged In . Remove any unfamiliar sessions.
Many tools promising private profile viewing contain hidden malware. A study by the National Cybersecurity Center (NCC) found that many apps claiming to offer anonymity features often contain malware. Once installed, these malicious programs can: anonymous facebook profile viewer
Facebook keeps profile viewing history private for two main reasons: 1. User Engagement and Retaining Users Immediately change your Facebook password