How to spy on someone’s Facebook without them knowing?

Any Facebook user can spy on someone’s Facebook without them knowing by following feed, posts, viewing pictures, reading comments, and this way making their conclusions. However, to know some specific information like Facebook messages, spyware is indispensable. It is a kind of software that allows seeing another person’s Facebook messages without them being aware.

Usually, spying on Facebook is one of many things (features) a user can do with someone’s phone when using spy application. Besides a textual content, it is possible to view shared photos and videos, links and gifs. Facebook messages can be tracked by the following apps: SpyHuman, Copy9, Spyfone, mSpy.