According to Google Plus team, facebook is banning Google Plus Sponsored ads on Facebook.com
There is no solid proof or official announcement from Facebook about banning Google Plus related ads on Facebook.com
A member from Google plus team posted about this on their Facebook page.
Facebook bans Google Plus Sponsored ads. A man recently ran an advertisement campaign for his Google + profile and his account was suspended. Looks like facebook is scared to lose its throne.
Below is screenshot:
I think the real issue, or at least the real alleged issue, is that they banned all his other stuff too.
even our sponsered ad for facebook was disapproved
http://www.facebook.com/photo.php?fbid=246108952084471&set=a.214040238624676.64662.213963848632315&type=1&ref=nf
“The content promoted in your ad is not permitted on Facebook. “
This is really bad. Facebook should respect competitors.