Board Thread:Support Requests - Community Management/@comment-24264457-20180219165034/@comment-9605025-20180219212504

This is well beyond any help anyone here is authorized to give. Plus, the situation is so vague that the correct course of action really cannot be determined. However, the most you can do here is block User A on Wikia wikis where appropriate given his/her behavior on that wiki. If their behavior on Wikia truly merits it, you can contact staff.

As for other social platforms, you must contact the respective service providers regarding this issue. Depending on applicable law, possibly law enforcement.

For sure, when it comes or real life, only law enforcement can do anything about it. Even then, the situation can be quite complicated given the large variances in local, county, state/province, national, and international laws, regulations, and the like.

Honestly, unless you have either a fortune or nothing else to do with your life, chances are you cannot do a whole lot.