The following eaxmple code demostrates filtered and unfiltered rendering of content from Google+. Clicking Render without filter shows content that is not from posts on my Google+ profile, clicking Render with filter will only return content that was referenced by my profile.
Try other posts from my blog like:
http://gusclass.com/blog/2012/07/31/oscar-the-hangout-robot/
or even other URLs like
http://google.com/test/