Furthermore, the author of the blog post in question republished his own Facebook email on http://corywatilo.com/reminder-cory-invited-you-to-join-face...

Although his email opt-out link has been edited out of that email (see "please clic to unsubscribe." at the bottom), it appears that the email was originally published to Posterous in its entirety via his iPhone and then edited later, after it was picked up by Google.

(Update: The author of the original blog post acknowledges this below.)