I believe existing justiciability administrative law is equipped to handle cases from the social media age. Justiciability is simple a set of rules that create guidelines to help decide if a case can be heard by the Supreme Court, the social media age does nothing to change this process. It doesn't really affect it in my opinion.
Yes, existing justiciability administrative law is equipped to handle cases from the social media age, because if anything, it has become easier, as we are able to find out more information than we ever have before. The law is always adjusting as new technologies and new ways to break the law come forward.
Times have change and things are not the same as they once were when some of these laws were created obviously and because of that they may require some refining or updating so they will not become obsolete. It may be a tedious process, but it is important that they keep up with technology.
Existing justiciability administrative law is not equipped to handle cases from the social media age. Although it can handle some issues, more laws have to be made to keep up with the changes in communication created by the internet. If we don't do this then we will have much less peace in social media.