From a Google filing in court about Gmail privacy:
>Indeed, “a person has no legitimate expectation of privacy in information he voluntarily turns over to third parties.” Smith v. Maryland, 442 U.S. 735, 743-44 (1979).
> it's "inconceivable" that someone using a Gmail account would not be aware that the information in their email would be known to Google.
Also referenced the scroogled ad campaign to support that users know and accept this behavior.
/facepalm