This Gizmodo story says "Prosecutors also allege that Facebook violated the United States Wiretap Act," but links to court listener, which seems to be all about a class action.
I have two important questions:
1 - is there an actual criminal prosecution involved, or were the journalists misinformed?
2 - If there's a prosecution, where's the criminal complaint?
https://gizmodo.com/project-ghostbusters-facebook-meta-wiretap-snapchat-1851366093
https://www.courtlistener.com/docket/18714274/klein-v-meta-platforms-inc/