By the time this column is published, Google’s shiny, new social network Google+ should have approximately 20 million users. It’s one of the fastest growing services of all time. Have you joined yet? Still waiting for an invite? You can find my Google+ profile here. I’m asking myself and you this: Is this growth due to the sentiment that Google+ is basically an improved version of Facebook? Or maybe it’s something else? Google can learn a lot from Facebook, including…