Clarence - 2:36 am on Feb 14, 2013 (gmt 0)
Google doesn't have to go behind the Facebook Wall. FB Pages are public.
If Google see's your Facebook page with 100,000 user "You're Linking to it and It's linking to you with same name" vs your competition with no Facebook page you will probably get more creditably and ranking "All things being equal"
Same with twitter. Social signal are taken into consideration.