Re:Facebook Bans Advertiser Pushing Google+ Follows
by thrill on Monday July 18, 2011 @09:13AM
(#2776132)
FB would have no idea if the user had permission to use the G+ trademark or not, unless Google had complained, which has certainly not been a part of this story so far.
IANAL but Google have strict rules on how you can use their logos: http://www.google.com/permissions/guidelines.html
And facebook ads' terms of service is pretty clear about having the right to use them: http://www.facebook.com/ad_guidelines.php