From the From a Conversition Blog:
First, the standard Conversition methodologies were applied including collecting thousands of comments about Google+, Google Hangouts, and Google Circles from across the internet. Whether the comments were written within the Twitter, Facebook, or Google networks, or from thousands of other forums, blogs, and websites, a wide sample of opinions was gathered. Second, we evaluated how positive or negative the opinions were. Third, we examined the sentiment based on the source of the opinions.
Read the Complete Blog Post and Review Chart Titled, “G+ Opinions Within Social Networks”