For some reason, I got an email from BP about their new posting rules. Not sure why I got it, since I've only looked at their ads a few times. Here they are for your reading pleasure:
We have just completed an analysis of the site to determine what necessary changes should be made to better protect our communities. As a result, Backpage.com has implemented new safety enhancements in the last few weeks as follows:
Review of all new ads and images in the personals and mature sections of the site.
Implementation of key word searches to quickly identify possible illegal advertising.
The blocking of off site html images to block images that violate our site usage policy.
Implementation of a new content policy to disallow nudity across the site.
Enlisting of safety experts to help craft further safety strategies.
Please pay close attention to the posting rules on top of the posting form for more guidance. With postings under review, you may also notice a 20 minute delay in your postings going live. In addition, pics in your postings not meeting our new policy will be removed.