It would make sense for Google to cannibalize their social network, because G+ is more a defensive, strategic alternative to the existing social networks than a

It would make sense for Google to cannibalize their social network, because G+ is more a defensive, strategic alternative to the existing social networks than anything else. Google would love for the walled-garden social networks to give way to open social networks -- closed social networks are probably the number one threat to their position as the center of the web.