Spearman correlation between variables.

<p>Medium correlations (≥±0.300) are highlighted in bold. Italic values indicate correlations based on papers with at least one of the respective events, i.e. blogs (n = 24,971), Twitter (n = 287,886), Facebook (n = 62,887), Google+ (n = 10,082) and mainstream media (n = 9,172) mentions</p><p>Spearman correlation between variables.</p>