Definition - What does Facebook Stalking mean?
Facebook stalking refers to the use of Facebook to follow the online actions of another Facebook user. Facebook stalking may include excessive viewing of a particular user's profile and pictures, as well as repeatedly messaging or posting comments to another Facebook user.
Facebook stalking is much like any other type of stalking except that it uses Facebook to track the target's actions.
Techopedia explains Facebook Stalking
Some sources suggest that one way to spot Facebook stalkers is by looking at the updates you receive on your Facebook news feed. If you are getting updates from a "friend" you never interact with on Facebook, this could be a sign that that person is visiting your profile on a regular basis. Facebook friends who comment on old photos may also be a tipoff, as this suggested that the stalker is systematically going through all of your archived photos.
Stalker apps, which claim to be able to provide users with information about who has been viewing their profile, have also circulated on Facebook. However, these apps are generally phishing scams that aim to gain access to users' profile and personal information.