Have your lawyer file it in the case.
Your question should have been dealt with in less than a minute by the lawyer. I'd worry if my lawyer took more than a minute to tell you what to do or tell you he'll take care of it.
With this social media-occupied world,
there's little mechanism one can utilize to protect them self,
The problem that I usually encounter is that when people posts something of harassing/harmful nature and then deletes it, there's nothing that can be done with it (screenshots are usually not enough, especially when for use in court).
Is there any web page or tool that's able to preserve the whole page on a SOCIAL MEDIA site that requires user log-in ?