If you hover over the little orange plus sign right at the bottom of this post and click on 'more' you'll see that Facebook is just one of the many ways you can share this post. Google has decided -
THAT'S NOT ENOUGH! and after pooling its considerable resources it is now prepared to take on the social network superpower, Facebook. So LEEEEEEEEEETS GET READY TO RUMBLE!!! Take the tour at
the Google+ project.