Google+ is now the No. 2 social network by most measures, and it's catching up to Facebook in some respects, according to a Janrain study. For example, the 34% of social logins by Google+ compares well to Facebook's 46%, and Google+ sharing is growing faster. The figures are more impressive considering Facebook's comparative age and a user base twice Google's size. Google+ "may even be a contender for the #1 spot in a few years," writes Dylan Tweney.