Google+ doesn't appear to "thriving" to me. Here is one indicator: http://www.google.com/trends/explore#q=google%20%2B%2C%20goo... (flat line). For comparison, add "imgur" or "hotmail" to the input. Here is another where it looks a bit better: http://siteanalytics.compete.com/plus.google.com/. However, considering the amount of integration with their other products, I can't see it as anything more than a disappointment for Google.