What u say when facebook is approaching his own ads programme database so google has to make step to put its giant programme adsense into Google+
I don't know if Google+ Can Cross Facebook If Allows Adsense, but I am %100 sure that, Facebook can cross Google and Adsense, If Allows webmasters to publish facebook ads also on their websites through a portal like "adsense". this is what we waited for long years from bingµsoft, but I can tell you that if facebook starts its own adnetwork, i can really say "awwww, sorry adsense, bye!"
Facebook and google+ had their separate platform. Due to some circumstances in social media, everyone wants to grab more business. If we talk about competition between both sites, my thinking is facebook is better than google+ and i don't think google+ crosses facebook.
G+ is far far far better than Facebook. WAY better privacy and coded way better as well. Hangouts, Circles.. Its Google so you know its good. Jyoti ABCPune