Public relations is a subset of marketing. Sure, some might argue that marketing is a subset of public relations, but those people are delusional. They read press releases for fun.
But going on the general premise that public relations is marketing communications then a public relations pitch should be considered marketing communications outreach. By that definition, PR pitches should be compliant with the CAN-SPAM Act. Sadly, few are.
The Chartered Instituted of Public Relations (CIPR) released its first edition of guidance for use of Wikipedia last week. See the full guide in PDF form here. The standards are a collaborative and still on-going effort that includes input from both public relations professionals and wikipedia editors (whom someone has decided to cutely call “Wikipedians”) and has been endorsed by similar organizations in Canada, Australia and the Public Relations Consultants Association, a British organization similar to the CIPR.
You can see and even participate in future collaboration on this project on their project Wiki.