How to spy on a Facebook account?

To spy on a Facebook account, it’s enough to follow a person secretly by following their activities on social media. However, this kind of information does not often provide necessary insights. What is public is not always truthful. This makes people turn to spyware. It allows to spy on Facebook messages and their content (photos, videos, gifs, links, etc.).
To spy on a Facebook account, one needs to find spyware with this option. Almost all brand-new spy applications contain this feature. These are mSpy, Copy9, Hoverwatch, Spymaster Pro.