How to deal with someone who constantly targets, defames and insults another individual on FaceBook?

[Stella]

What's scary here is that you claim to be all adults. For adults, you are all acting very childishly, especially the one who is semi-retired and talking trash about another.

You say there are social consequences, but, if someone knows you all, wouldn't they know who the crazy one is? How can they spread lies in a social circle if you and this victim are active in, when the person creating the posts apparently is too busy posting trash to Facebook.

As adults, you need to go to your social circle and tell them what is going on and if they are really your friends, they will stick by you because they will see that the posts are just garbage. Those who don't stick by you, or up for you, are not your friends.

Also, the more attention you give this guy, the more he will keep at it. Honestly, the police will do nothing about it because other than insulting you, there are no real damages. However, if the defamation is causing job loss or other monetary loss, you can talk to an attorney (barrister) to see what you can do about bringing a civil matter against this guy.