10. The computer program product of claim 8 , where the expressive content of the grouped social media postings comprises expressed opinions within the social media postings related to a topic, and where, in causing the computer to determine the differences between the expressive content of the grouped social media postings at the different degrees of social network separation, the computer readable program code when executed on the computer causes the computer to: correlate, within each group of social media postings, similar expressed opinions of social media postings into expressed opinion sets; and determine differences between the correlated expressed opinion sets within each group of social media postings.
10. The computer program product of claim 8 , where the expressive content of the grouped social media postings comprises expressed opinions within the social media postings related to a topic, and where, in causing the computer to determine the differences between the expressive content of the grouped social media postings at the different degrees of social network separation, the computer readable program code when executed on the computer causes the computer to: correlate, within each group of social media postings, similar expressed opinions of social media postings into expressed opinion sets; and determine differences between the correlated expressed opinion sets within each group of social media postings. 11. The computer program product of claim 10 , where, in causing the computer to determine the differences between the expressive content of the grouped social media postings at the different degrees of social network separation, the computer readable program code when executed on the computer further causes the computer to: determine a predominant opinion among the correlated expressed opinion sets within each group of social media postings; and determine differences between the predominant opinions across the groups of social media postings at the different degrees of social network separation.