The simple way to test if the account was ghosted is to post something regular and use less popular tags.
Once you done the post, go to an acccount that is not fallowing the suspected ghosted account and check if you see the post in the tag page.
Other way I check it is to copy the tag page and go in incognito on chrome with no account logged in.
If you see the post then you are ok.
If not you disable the account for 2 weeks or email support.