Facebook strengthens its leadership position by changing the way it controls the volume and content for promotional posts in the News Feed. Effective January 2015, users see more stories from friends and Pages and less promotional content (An Update to News Feed: What it Means for Businesses). It’s likely that Facebook’s News Feed adjustment increased engagement with the social network and, as a result, sharing activity increased. This quarter, Facebook represented 84% of sharing volume, up 12% from Q1 2014. Blogger, which makes up 5% of sharing volume, also saw a slight uptick in activity compared to last year (+2%). Meanwhile, Pinterest and Twitter saw slight declines in sharing (-5% and -3%, respectively).