After the failure of Orkut and Google Buzz, Google is still motivated to try to compete with Facebook. The company just released a new set of social mobile applications. Only happy few are able to test it, but the concept seems to be quite appealing. (Go on Google +)
Although I'm certain that Google can design an awesome platform, I doubt it could become mainstream. What makes the power of Facebook is that (almost) everybody is on Facebook. It will be hard to make them switch from on network to another. Even though many people are complaining about Facebook privacy issues... do you really thing that Google will be better?
In the main time, Google+ is focusing on mobile applications. That might help... but I don't believe it will be a huge success. Check out what people think on Beansight about Google+.