Talk to an immigration lawyer, a non-government immigration lawyer. The best strategy is to avoid triggering any sort of investigation. Even if there is zero evidence, even if you have done absolutely nothing, the investigation can make your life hell for years. As a private person I support freedom of speech. As an attorney, in this political climate, I advise not saying anything that might draw the attention of federal officials. They do trawl online forums for comments. They do investigate facebook posts. They do target individuals vindictively. I advise never saying anything about anyone's immigration history.