I don't know why are you talking about FB beating Google - they are not even a comptetiton. Facebook is the biggest social network and Google is the biggest search engine. I also don't see any benifit of PR10 for my activities in social media marketing.
Follow me on Twitter: @hendricius
agreed with hendricius...well said buddy... they both are just two different things.. no point comparing them...both r kings in two separate areas!!